Hey dude! Been sneaking a peek and I like what you’ve been doing. I’ve noticed a few things I thought I’d share with you since who knows, they might be useful. Did a bit of drawing on top of your static, front skelly to illustrate my points, hopefully you won’t mind.
So from top to bottom:
The deltoids seem too large. Look at pectorals as a point of reference to see what the right size is; you’ll notice even on my version, they are still on the bigger side.
The latissimus are too hidden. Remember these muscles have a pronounced curve, and when you look at them from the front or 3/4, we should be able to see more of them. I’d say this and the previously mentioned deltoids are the usual suspects in your sketches.
Hips need to expand out to the sides a bit more.
I think a few references might disagree with me on this one, but I feel like the abdominals distribution needs to be pulled up. Lower ab is generally the largest one. Look at the bellybutton to see if it makes sense where you are starting it.
Overall, I’d say you are getting the muscle placement right, but the proportions are hit-or-miss right now. I insist that I think you are doing great, and all I’ve said can be easily worked on and fixed. Keep up the good work .