I keep hinking about your sig and coming up with more critique. lol.
I just wanted to tell you to try and make your blending smoother in later sigs. IN all the sigs I've seen lately it's like render and then BAM Lots of smudging. Try to slowly easy into it more, Just be careful of it because in this sig you can only see like 1/2 of spidey because of the abrupt blending.
Nice job though.