I like the drawing and the way you vectored the hair. The background is okay, but I would've liked it better if you used more blue to fade to the black (instead of going straight to black). Also, the skin is nicely vectored, but I think it needs some outlines, at least to define the hand. Lastly, I kinda wish you put that wing in there too, 'cause it looks cute ^^
as for updating, does the downloaded image not change as well, or just the thumbnail? 'cause if it's just the thumbnail that doesn't change, it might just be cached...
