Hello there !
I decided to improve my sculpting skills in Blender with dyntopo.
Latest Update :
My first attempt:
WOW! That is really good.
@Garrison H : Thanks even if I’m not quite happy with the result right now… 
@BjarkeDude : I think you need to start on a base mesh that you modeled in edit mode with a small amount of faces.
Then when you start sculpting, constantly look to your reference images.
Leopold, good job overall, features are not in the average but convincing, his mouth is a little too flat at its corners (no muscles around) but still possible.
The only incorrectness is, imho, that the ears are too far back (from what I can see), and a little too out, hence the head is a little too large in the middle respect to the eyes distance. Maybe the head should also be a bit more flat at the top.
Keep it up and good sculpting!
paolo
Yeah but that was my first sculpt. I got the hang of it by now 
Thanks sourvinos for your advices ! 
~400K
I tried to work on the eyes and the mouth…
And a quick render just for fun:
I will certainly try another sculpt, as this one is a big mess
nice job. i really like the nose and the ears.
still, i see something not entirely convincing on the overall proportions.
you should probably try sculpting the skull, it really helps understanding the forms 
you can also try a different approach, like studying the Andrew Loomis scheme for the construction of the head.
anyway, as first attempt i think it’s really good, keep sculpting
@Naughty Ogre: Thanks a lot for your advice. I noticed effectively that proportions of the head were not good at all.
Here are some experiments with the precious help of Andrew Loomis books:
I will post a new sculpt in couple days.
Attachments
Update->
2nd attempt, eyes and lips need work. I think that the overall shape is better than the first one. I’m still drawing with the books of Andrew Loomis and it helps a lot on the anatomy.
Still Dynamic topology ~180K triangles
And a render for motivation:
As always, any suggestions or thoughts are welcome.