I think because he’s arching his back, and standing on his feet. It’s exposing more of his stomach. So I think the abs look normal, but you could shorten the lower back by 2 inches maybe.
This isn’t the traditional pose for crucifiction. Christ is usually shown hanging from his hands. Where as here, he looks like he is standing up and has back pain.
Are you doing Christ on the cross? I’ve always wanted to try doing Christ, but lack the talent to give it a try.
I think a more weathered, and aged looking cross would look better. Something like old drift wood? Maybe make the nails longer so they look like they were driven in hard, and long.
I can’t wait to see it finished!