This drawing is really rad :D I think the one thing that would make it better would be a little bit less airbrush for the shading , or rather the darker shading. The anatomy is really good imo, especially the pose you chose for the figure,which i personally have a difficult time drawing people sitting at that angle. The lighting btw i reallly like , its very well, just illuminating and i feel that the airbrush is perfect for that ^^
Overall really good job : )