I really like the attitude in this bust Laurent. The pose and look of intent is great. I have to admit though, the upper lip looks a bit off to me. It looks like it could use some defining. Particularly in the philtrum (little divot under the nose) and the upper lip. It doesn't have that nice "cupid's bow" shape to it we expect. Look at the opening of the mouth from both sides and notice that it takes on quite a different shape from one side to the other. A little work on those areas and I think you'll have a genuine winner here!
Jay H.