Hey there! You have a solid foundation, and the figure itself has good proportions. However, you need to study muscles to understand how the muscles connect and how they look in different positions. (For this, you need to practice drawing and manipulating forms.) If you don't study the muscles, your figures will look unconvincing or flat, even if you already have a good foundation in figure drawing. Whether you have the opportunity to follow the roadmaps offered by ArtWod or not, try to get learning from other sources such as Figure Drawing: Anatomy and Invention by Michael Hampton. I highly recommend it because his teaching approach is very easy to understand. :) Hope this helps!