Hey Olivier!
Very nice update on your little guy!
I’m amazed to see your progress knowing you started to learn ZBrush not later than a month ago!
Looks like you started to play with alphas to do the tongue texture.
Work the main shapes as much as you can before going into the tiny detailing, that’s a rule of thumb! I think you still can improve the overall volumes of the tongue (flatten the tip a bit more? make it less fleshy? reduce the bump in the middle?).
For the teeth, I’d suggest you to make a seperate subtool for that. You would have more freedom to give them a nice shape and place them a bit more behind the lips. Right now, it looks like it’s just an extrude from a serie of masked dots drawn on the bottom side of the upper lip, and I’m affraid you don’t have enough polys in the height to curve them even a tiny bit.
Like that:
http://www.oceanchampions.org/blog/wp-content/deep_sea_fish_1.jpg
You should try to use the inflat brush a bit for the tip of the teeth, to make them slightly less pointy.
I hope that helps, keep it up buddy, you are making giant steps in your learning process. :)