Okay, so maybe make the circle a little smaller? I was hoping the ring part would be visible on the outside parts of the shield, but I'm not sure how it would look tbh.
and out of curiosity, what would the banner look like if you swapped the white with the red?, or maybe red inside the circle and a black background?
I think the skull proportion is correct, maybe a tad smaller to fit the ring? I think it looks good otherwise.