Thank you everyone!
Voidmonster, Yes likeness can sometimes be really tricky and I’m having a hard time with this one. I use Shave but I export the mesh using FBX format to Maya.
rookie-z, Thank you, I use a lot of references but the problem is that, on some he looks heavier, slimer, older, younger, etc and it’s hard to catch the likeness… at least for me. I went back and changed a lot on the head but I’m not done yet.
odhinn, The model, lighting, shading and rendering is done in Modo… I use Zbrush because I’m used to it and it has tools we don’t have yet in Modo. Besides, Modo painter works great to paint bump as we see a very good result in the opengl view but it doesn’t really do displacement painting yet.
Dezz, Yes the hair sucks but it’s because I have just started and I should have waited until it looks ok. Yes, you’re kind of right, I’ll come back on these eyes asap.
javalabala, I decided to work with layers as it gives a much better control on the final output. So in Modo, you can easily separate the rendering as SSS, Specular, Diffuse, etc only and then compose them in any compositing package such as DF or even Photoshop.
I totally agree with the likenesse problem, that’s why I spend some time this afternoon to completely rework on the mesh and a bit on the displace. I also render some extra layers and tweak the shading a bit more. I’m not done yet but I hope this direction is a bit better in terms of likness and shading:

The Eyebrows on the new version is a quick and dirty hand painted stuff on the texture, I’ll get back to the Shave part as soon as I’m happy with the overall look.
Jacques.