How to monetize Tumblr?

Sorry for my english in advance.

I have blog on tumblr that have 2500+ followers. I post tagged photos, not reblogs, with sensual models and fashion, not adult ones. GA shows i have 2k+ UU/month. Ad Sense don't work.
How can i monetize that site?

Popunders? and networks that pay per for every impression/visitor : CPMFun

0,30$ for 1000UU is low, this give me ~0,70$/month.