Sure man, in the 4th the value separation is a mess. You can turn that img in black and white and see for yourself that you can't tell what's in front of who everywhere and the perspective is off (i'm telling this by eye, i don't know how much exactly but i'm pretty sure). For the 6th img the design is not working and is really imperfect. I don't know if those tusks have to be specular but it seems to the viewer and it a point where you notice that something is not working. The arms too are not correct cause this creature can't move the lower arms like this and on a normal viewer eye this stuff keeps bugging the mind.
Even if there are no daytime picture your technique is very good as i can see, where did you learn to paint like this if i may ask?
Thanks for the feedback and i totally agree with the material renditions. I always thought about that, but still, let my hand overdone things hehe About how i learned, i just draw a lot and be inspired by several artists like, briclot, rapoza, kutsche, dylan cole, and more. Actually I'm still weak in anatomy. That's what i want to improve and focus on
Hehe it's a really common problem, 50% of us have that and the other 50% have the opposite (like me) and after a copule of hours it becomes boring. Anyway are you telling me that you learned this much by studying all by yourself?
About anatomy when you reach a certain level of understanding of 3d shapes is really easy to learn.