As for advanced critique, I think the should would have had more effect if the eye would not have been partially covered by the shadow. It also looks like the shot could use some further sharpening (Smart Sharpening in Lightness Channel of Lab Mode in PS is pretty good). However, these are only small details so now worries!
Thanks for the tips Zkeleton, I'll play around with sharpening it. I haven't really messed with Smart Sharpening before, so it will be cool to learn about it. Take care and always feel free to offer any critique.