I wanna be a sauropod

Remember when all of those so-called prosauropods were depicted as quadrupeds? Now we know they're all bipeds, but there's one that I know of that you can still put on all fours: Melanorosaurus readi, an 8 meter long sauropodomorph from the Early Jurassic of South Africa.
I've been sporadically busy with this one throughout the month trying to digitally colour a pencil drawing. Not so sure about the underlying musculature of this animal, I'm trying to get a grip at detailed anatomy. Tips are always welcome.

Yup, those are sparse protofeathers.