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Not pro advice but my 2 cents:
Looking at a bat wing I would say his upper arm should be shorter with all the muscle. His forearm should be longer and sleeker rather than even length.
You might make the top bone smaller and the second one the longer bone but up to you. Most creatures have 5 digits so I think you are short a bone but then its a dragon so who says you have to follow the rules. The first part of the top bone is bent in a weird way rather than at the joint but maybe that’s intentional?
Cheers for the advice. When I looked at my post in the forum I could see parts of the body that I needed to ammend and I took into account your advice regards scale of the biceps on the wings. Ta for the help 