Spicy Image (Spicyimage)

Question: 

I have the Site http://www.spicyimage.com/. I have a nice pagehits around 4.5K per day, but with no PR. Can you please look at it and help.
It has a good alexa rank though.

Suggestion: 

PageRank has got nothing to do with number of hits it receives. Does this pagehits arrive due to back links alone? As it is a login authentication site there is no/less information to crawl and store (probably the user images might be crawled and indexed). I was unable to find much back links (with link:www.spicyimage.com in google). If you could let me know specifically what you are looking for to happen that would be great.

Cheers,

Shiva