Hey, great color values first off! you have a really strong sense of light and value
and great overall tone
as was mentioned above your figures could use a little more dynamic energy, especially the humanoid ones.
could just be the posing & angles , so as long as its not a character build, (where it has to be strictly representational) i feel like you can have a bit more fun with the perspective and poses ( i recommend getting a friend to pose quickly and snap a phone photo for reference)
I also noticed some anatomy issues in the gorillas, i know they're early sketches but the last ones arms seem off right away
otherwise really great work! love the environments especially, seems to be your strength (lots of interesting dynamic shots, good overall composition and framing)