I think it looks pretty good. If you want a little more realism, I'd suggest that you look up references for red hair, as there tends to be all sorts of colors to play with in any given natural hair color. Unless, you have him with dyed hair?

I'd say the same goes for the ears. Right now, they seem a little flat, and it throws off how nice the rest of it is. A little touching up here and there, and you're are good.

Nice work in the skin tones and textures, teh volume it´s good too.
Nice character design!

I agree with yerffej. Personally I think there's nothing more beautiful than natural red hair. The man is very handsome and has character. You did a good job on anatomy and the cloth folds. The artwork is allready good as it is, but I still want to suggest you to push yourself and make it even more good! Add a body, a background, a few more details and you will have an awesome painting.

Thanks for the input yerffej and SandraS... I never meant for him to have realistic colored hair, but I took your advice and redid it to look even a little bit more realistic. Fixed the ears too. Eventually, I hope to create a body for him, but for now I think I'll keep it as a portrait. Thanks for the feedback!