So I'm working on a Steampunk Flamethrower and this is the emitter.  Does it look steam punky enough?  I think it needs something but I don't know what. Any ideas?

Perhabs a pilot light. Since its steampunk maybe something like a Kerosene lamp... ya know an adjustable wick kind of thing. 

A pilot light is an excellent idea. I could see one mounted under the front and pointed into the path of the flame, in the shape of the nozzel of an angled propane torch.

I see a couple of issues. First, it's too symmetrical. Steam punk has the look of something home made, or something assembled by craftsmen, not something produced from an assembly line. Steam punk is also heavy duty, unique and somewhat crudely functional. If this flamethrower is designed to be carried, then it should have a separate cannister of fuel, which is logically carried on one's back. There would have to be a hose that connects it to the flamethrower, but not a smooth hose, perhaps one with metal rings, a metallic webbing or something and the connections should be heavy.

If the flamethrower is to be fired from the hip, then the handles have to be well-placed, maybe two of them, one to a side mounted fore and aft, and the detail is everything. There might be a guard -- like a muffler guard on a motorcycle -- around part of the main piece to protect the user from the heat, and the handles should be in parts, likely something bolted or screwed on, and perhaps a flat guard on the handle to keep the user's hand from getting too close to the main body. If it to be fired like a rifle, then it might have a large iron ring sight.

Secondly, texturing is critical. Rivets, worn and heat damaged metal, leather, sculpted wood, etc.

That looks pretty neat! I think that you're close. This is just my opinion, so take it for what it's worth and feel perfectly free to discard it.

The three small rings on the end of the nozzle look appropriately steam punk, as do the bulbous sections, and the line is sturdy enough. However, where the line attaches to the nozzle looks fragile, like a blow from the side could cut it. I imagine a heavy nut holding the line down and the line coming in from the side at an angle rather than from the bottom (similar to modern flamethrowers). Also, the wooden back brace looks uncomfortable and the wood at the bottom of the flamethrower nozzle looks like it was attached with Duct Tape.

Have you looked at pictures of flamethrowers? They have two tanks, one for the jellied gasoline and one for the propellent. The tanks were mounted on a metal rack, which the soldier attached to his back with straps. The US, German and British models were rather similar.

If I were doing it, I'd probably follow something close to those designs, but switch a few things around, like making the strapping or webbing and the structure of the rack slightly different. Whatever type of straps that are holding the tanks to the rack should be given some special detail. If they're metal, they might have holes cut in it or something. If they're made from a cloth or leather strap, they should have clasps. I like the brass look, but practically speaking, any army would paint over the brass to keep the gleam down. Of course, the brass would show through in places with scratches and so forth due to rough handling, and that would give a unique look.

The WWII nozzle was fairly similar to what you have, but lighter and thinner towards the rear and overall, somewhat shorter.  The dimensions in the steam punk world are less important than what looks generally realistic, of course. As I said, I like the three rings. An exterior lighter would have been nice, but this is even better, IMO. I can well imagine the rings as an electric igniter, and it certainly gives it the right look. Now, the question that comes to mind is how would one hold and fire such a weapon? 

A flamethrower from this Earth is usually a two-handed weapon with two pistol grips mounted beneath. Generally, there is a switch on the front grip that ignites the mixture (the igniter often being a hot electrical wire), and the one in the rear has a trigger to release the stream.

Naturally, there doesn't have to be two pistol grips, just two triggers and two grips of some sort, or one grip and another place on the front part of the nozzle where one might hold it to keep it steady. Here's a chance to make it look more unique. A grip might look like it was screwed into the side, or the one forward might be mounted on top. Whatever, just so that it looks a tad different, and perhaps crafted in a machine shop.

Thanks for the reply Aardvark! 

I agree with a lot of what you're saying, I haven't gotten to the straps yet (doing that today) or the grips for holding the beasty.  I'm treating this like a MK-I flamethrower, I.e. a prototype.   The guy making it has just cobbled it together and hasn't worked on the ergonomics yet.  I've got some batteries to attach to kind of "show" those rings are the electric ignighter (like you guessed) along with the mixer/flow valve that goes on the back. 

I agree a big giant nut will look great for the hose connections.  I think the MK-II will look more like a real flamethrower but going off of no references (but the ones in my head) not so bad eh? :)

Oh!  As for holding it I was thinking it might be held like a Smartgun from Aliens.  You know big grips over the barrel allowing it to hand down and aim with a grip trigger on the rear and the front grip just for support.  I want it to have the feel of being too big and unwieldy to be a production model you know?  :)

Thanks again for the feedback!