Hey Dave,

The proportions work pretty well but as that's already becoming a pretty detailed model I agree with the refs. Look at the abs especially, with that kind of muscle definition your ribs would not be that prominent also they occur higher up. I added some refs for how these muscles run anatomy wise and also what kind of result you'd get on a beef jerky like this, comes with absence of brain a lot of the time I've noticed. In CG people love to add exaggerated muscle to their sculpts, it fails a lot of the time because they don't use correct anatomy drawing up the main muscle groups before modeling really helps here. Personally I prefer models that follow the final image, I think it helps add realism to a model as pumping your body to that extent is not natural.