Actually, I think it looks great, and I love the reference photo you used! There's some jagged lines in the legs and some of the elbow. I edited a slightly skinnier version for myself, but I mostly just "pushed" the pixels around to get rid of the jagged lines. WOOP WOOP, your stance is awesome. "Skinny & Skinnier: Superstar Saga"! Spoiler: Edit comparison
You sprite your own clothes on each and every template you want. Also welcome! Go make an introduction or somethin.
here's a tutorial to get you started: link regarding the pose it looks really clean, i don't know a lot about martial arts but it definitely feels legit