well, there's more to it in general.

first, there's getting the right image or HDRI for the source of your IBL.   you want something that fits your environment and your artistic goals. then you want to add particular lights based on realism but also where you want people's eyes to go, the mood you want to set, etc. 

personally, i've never really assembled an outdoor scene i like, so i've never tried to do a jungle scene.  i really don't know the best way to light it.  but i'd say the key to it being interesting is the shadows cast by leaves and trees, and the differential between the ambient green and brown light under the trees vs. the yellow light of a clearing.   you can fake cast shadows effectively with "light gels," which are just images attached to the diffuse color of a spot light.  you can do the same with an infinite, but i've found it hard to scale the effects properly.  find a good, free picture of some appropriate tree tops (no maples, for instance), make it properly greyscale and dark where the leaves are like a shadow, and attach that to the light.  there are lots of free photo resources out there, and trees are a pretty common subject.  the only trick will be trying to find tropical or jungle images, but i'd bet you can find them.  once you've attached the image to the diffuse color, change the intensity and scale of the image node to make the shadows fit your image.

it's a lot quicker and easier than actually using trees to cast shadows, but you can do both.

once you have your spot, your IBL and maybe an infinite in place,  i'd suggest finding a reference image or 3, and tweaking your intensities and colors to match them.

Lenora2 - if you just want the glancing lighting, blinn node in alternate specular should do it.  you can also control the blinn's settings with edge blends to refine it,  but i think plain blinn should give you the look you want.  i think the real trick is going to be getting the lighting you want.  if you're still working at it, maybe you could post some WIPs and say what you'd like to change?