I like your style for Sally--her smile is vibrant and alive compared to the calm one she usually wears throughout the Sonic SatAM series. As for her breasts.... hmm... it's different, I'll give it that. I'm not used to seeing THAT much of Sally, and in the series she is serious and conservative, so this is not something I would expect to see in a picture of her. It doesn't look bad or anything, just different.

The wings are an interesting touch. They have just enough detail to illustrate what they are without going overboard. The light shading is good too; a little more would have been nice though. Love the boots---big and ready to stomp a mudhole in Robotnik's behind (or Sonic's should that hedgehog get out of line!). Great job!