Acadia pretty much hit the nail on the head. Here are a few other tips:

• Post a thumbnail highlighting anything that looks like cleavage, the curve of a boob, the crease of a female thigh, or a female butt crack. You can use a horse's ass, but if it even remotely resembles a human female it will work.

• Do pinups and use the same "glowing", gaussian blurred, photoshop actions and the same cookie-cutter scenes and styles and/or poses over and over. As long as the women are scantily clad or naked, you'll get hits. This also applies to fantasy, fairy, and scifi images.

• Form a large mutual admiration society and get them to favorite your images so your images get into the "Art Charts", the latest, still mostly useless version of the mostly useless Hot 20.

• Buy the latest hot scene, figure, clothing, in the Marketplace or from DAZ. Pose her standing or sitting, holding a gun or sword, with dead eyes and a blank expression and say I just bought (fill in the blank)'s sexy new outfit/character and just had to make a render with it.

• Lesbians, or the suggestion of lesbianism...guarenteed to get hits!

-Don't post on the weekend. Practically everybody posts on the weekend. That's probably the quickest way for your image to get buried deep. 

There are more, but those are the most important...lol.

Less views and less comments are a side effect of the site growing so huge. There are tremendous numbers of people posting, making each post go farther back in the line and faster than ever before. There is too much to see and not enough time to comment and still see as much as possible. Without an interesting or "teasing" thumbnail to draw attention to your work, most people have no incentive to look. Above all else, it's still a matter of sex sells. More people are interested in seeing nudity/sexyness than seeing quality work. If that wasn't the case, they wouldn't get the most hits.

It's all fun and games...
Until the flying monkeys attack!!!