Well, the shading on the sprite looks neat, but the pallete, ugh... I dunno why but I still feel that Sonic's head is too square-ish. I guess it's because of his forehead being large at the sprite and the lack of bright spots like the original sprites.
Yeah. I guess some bright areas changes everything. (also made Sonic more brighter, like on the original sprites)
The title screen looks decent, not sure if I like it very much, but decent. Sonic always found a way of making a pose with the number of the game, but without missing the "I'm radical" feeling. There were always signals to that, like this (I guess that skaters use this signal) on Sonic 3 box art:
Or the "V" of Victory on the Sonic 2 box:
I guess you could find a way of saying "4" without missing the "yeahhh I'm radical, uhhhh" that Sonic had in the 90's. Perhaps each hand with the "V" thing. Or maybe, since nowadays "nerd" is the new "cool":
Right of the beat, say 4 and make a Star Trekk reference. How can a game like this go any wrong?