Color test for new Ork army

Here is a shot of a grot that I painted up as a color test for my new Ork army. I am wanting this to be my show army ( I already have CSM, Necrons, and Chaos Daemons.)

I am trying out using glazing. So far it has been going pretty nice. I was happy with everything on the model except for the flesh on his arms and hands. I think I just need a bit more practice. I really like how the face and gun turned out.

The color on the tunic was just right but I needed another layer or two to even it out.

Let me know what you think I need to do to improve.