First portrait. .. feedback please!

This is the first portrait I've done.. but I need a lot of help! I'd love to get to a point where I can do portraits of family and friends, and this seemed like a good first step...
The head shape isnt perfect, and he somehow looks a bit aggressive!
Also, I think i needed to be a bit more patient in between layers, as especially on the left side I got some horrible blooms!
All feedback appreciated :)