anatomy practice

okay. did a quick sketch, i dont think its the worse ive ever done. the proportions look okay i guess. but could you guys give me any tips? if not that's alright too. ive drawn a LOT of portraits, so now im trying to get into more of human anatomy as well to go along with it!(don't mind how mad the tattoo looks lmao). still a WIP since I also want to try out my SECOND most used brush, sharp horizontal.