Animal anatomy is where I'm at my best, so if I can be helpful anywhere, it should be here

. I drew up some redlines for you and will add some notes below it (besides the comments on the redlines themselves).
The first mistake you made which was easiest to pick out is it seemed like you tried to give the beast deltoids. Since it's a quadruped, it most probably won't have them or at least barely. Animals draw their front leg power from the chest and their "biceps and triceps". I don't believe they're called that on animals but I couldn't find their actual names. The upper neck muscle also flows over into the legs, it overlaps the shoulder muscle.
Your hind legs were actually pretty accurate, just a bit out of proportion and not "straight" enough. I can't explain it any better than that. Actually it's hard for me to explain anything to do with anatomy with words, because I don't know (and can't seem to find) most of the English names for the muscles, as well as some words I'll need to describe what I mean.
Do note that the redlines won't be exactly perfect either, it's always better to study actual anatomy than to study another artist's interpretation. I hope it helps a bit though

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I do love drawing dragon bums, they're so much fun!

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