Hi Lirfael. I think you did a great job overall on this. I paint in acrylics and teach classes online, and although I haven't done a digital painting, the outcomes were shooting for are similar. To improve: Try to soften some of the wrinkles. One of the biggest mistakes I see being made is that artists notice the fine details and nuances of a face and, in their enthusiasm to not miss them, they tend to overexaggerate the feautures. They will be too dark (or light) and the angles may be too severe.

But still, you really did capture the personality of the subject well, so fantastic job! The shape of the face is accurate, and the overall features are too. Keep up the good work.