the hair is wonderful. nice job there. but i think you can erase those dark outlines on some part of the hair. it doesn't blend with the whole. or you can change the color similar to the darkest color shade. Love the Eyes as well. The skin needs more shading, a bit vibrant so he won't look TOO pale. and also, i hope you can gave him a better background. Only Gradient + Text won't do unless you put some brushes/textures to spice it all. Its such a waste for the wonderful vector
and lastly, don't forget to put watermarks or your name in your works. Its a must or it will get deleted.
Nice job! Keep it up! :)