Thanks for the tips, man.
I'll try put some AA between the background and the hair! 

I saw this and rather thought it looked rather impressive, clear definitive shades and impressive usage of colours in the eyes.

But where the hair meets the background, and the shading of the hair at the bottom could be improved with AA. You could use the light blue, dark blue and darker pink to AA  the darkest color to the light green, dark blue to AA the hair to the background, the dark pink to AA to the dark skin color and perhaps the dark skin color to AA the dark pink to the orange. Heres a edit with that color choice,

     Edit          Original

I may have overdone it slightly but, it shows what I'm trying to say. Maybe you could even add a highlight in the hair with the brightest skin color.

Inglorious

Referenced from Bruce Timm's style, here is my sketch:
http://i164.photobucket.com/albums/u12/2pauloperes/avatar_poison-ivy_wip.jpg

jalonso

Glad you liked, man!

 Is this referenced from a Bruce Timm illustration?

cdn.comicartfans.com/Images/Category_40733/subcat_84325/Bruce%20Timm%20-%20Poison%20Ivy.jpg

Turned me on o.O