Other than looking pretty nice as been said, here are some crits, hopefully adressing issues in between the "style vs. tecnhical correctness" discussion.
I didn't read it as a sumo fighter, even a stylised one. He needs to be fatter.
Usually, large amounts of fat, as present in sumo fighters bodies (even the "slimmest" of them) will first gather around the mid-section, and when a certain threshold is reached, will begin to acumulate around near body parts, but always with the belly as their "source", moving along the body towards the tips of the limbs.
Excuse the rushedness, and possible lack of clarity. The sequence shows stages of "fattening", yellow as less concentration of fat, red with more. There are variations, individuals where fat tends to group more near certain parts than others in ways that differ from this image, but this is how it generally happens.
Considering the notion that fat covers the muscles, hiding them, and this diagram, the upper arms and legs should display larger quantities of fat, more bulk, and less muscle definition. He may be ripped underneath the fat, but the fat hides that. Right now, you have just a big belly - the red part -, and no yellow or orange ones.
Also, you have a recurring error in our humanoid pieces, you ignore doing the initial perspective construction of the figure, and then the bottom body's perspective doesn't match the top's, the feet are a bit wobbly and don't match the knees, etc. Check crits done to your previous pieces posted here in the forum.