Just a quick check: I wonder if these wings are even maneuverable enough to generate sufficient lift. Birds' wings contain multiple bones, as do bats', but this lineage seems to have points of movement only at the shoulder joint. Draco volans is probably a good reference for how it would work.
It's a bit odd its eyes would be proportionately smaller than its ancestor, even though its overall body size is half the size of its ancestor.
From the way these are drawn, they seem to have only one toe on each limb. Comparable arboreal animals have more than that: even goats have two toes. It's entirely missing claws. This is an important enough detail it cannot be excused as simply a stylistic simplification.
Can you add more shading to its head? It's not out of the question its head could be proportionately bigger than its ancestor, but its head does seem disproportionately big without a specified reason. Specifying the end of the skull and specifying any soft-tissue dewlaps could clarify the shape of the head.
EDIT:
Do you want to get this approved as quickly as possible, or do you want it to be revised to the closest possible approximation of your original idea? I’d like to approve every submission, even if it requires substantial image or description revisions. However, I’d also like to keep progress reasonably fast, without contributing so drastically to conceptual overhaul as to justify becoming a collaborator for a submission not originally intended to be a collaboration. If I know what you intend to achieve, I can craft my feedback more effectively.