Drawing from nature is the way to go . I don’t like the light changes though

Hi, I finished Proko's anatomy course and am currently studying Watts on Bridgman book. Below is a drawing using photo reference from his book. I mimicked his design for shadow shape but also try to create my own. Not sure if I can upload the photo from his book so didn't provide the reference photo here. Can anyone please provide critique on this drawing and where I can improve? Thank you!

I would be glad to hear critique and advice

i'm grateful Stab demos properly , it makes it look so simple to perform it and the explanation was simple too . Whenever i work on a piece , i'm thinking on the bone inside , on the position of each part , the egg effect as mentioned here ,

I’m baffled by how skilled Stan is . Respect. I’m also thankful this platform exist so we can learn from different parts of the globe

Well these are actually master studies however I’ve been very happy to finally understand how the external obliques attach to the serratus anterior