As an amateur portrait painter myself, I have to agree with Nathalie that the proportion and symmetry of your figure is a bit of a problem. If you are aiming for realism in your work, well...this isn't it. If you are trying to make more of an abstract work of your subject ( and let the viewers eye make it as realistic as they want), than this might do it. But, I'm sorry to say, for me it doesn't.
Because it's not finished, and I'm not a portrait artist, this piece is touch&go. A couple of friends asked for their portrait - or their dog's. I should have gone with the dog. But I love a challenge - that I think I can accomplish. So here's the acrylic underpainting - that I like a good deal.