[welter]

any tips on the arms?

[The Lost soul]

Thinner wrists, but from there to elbow, it gets quite a bit thicker. If seen from the side of the palm, or the back of the hand, it's moderately thick, but thinner when seen from the side of the hand, much thinner. Thicker upper calves, and smoother transition into the ankles(on the front leg being seen by the viewer. Shoulders are like a round mound of muscle, and tend to have more bump when joining with the torso... but honestly?
You're doing pretty great. Anatomy like this is hard to accomplish, and it takes a lot of studying to get it right. You've got a good sense of proportions, in that none of the limbs look too long(our vice).Generally, they look quite relaxed and don't have a rigid and unnatural position... Looks amazing, as far as we're concerned, but critique helps people grow. Still, you're pretty bloody marvelous already.

[welter]

@The Lost soul

Thank you! I'll make sure to reference your tips in the future. :>