Hey ashrumm, these are looking really good man. How's everything up in san fran? What school are you going to?
You may want to think about how your eyes are rendered. As of now they look like they were cut and pasted on there. This mainly looks that way because they have very sharp edges all the way around. Remember that in shadows, edges will be softer. You may even think about having hinted lines and edges, I know that Gregpro guy has a good paintover tutorial on here somewhere, he can explain it a lot better than I can. But other than that good job! hope you're doing well.