this is one of the few pieces that look really impressive although it's not as good in terms of realism (e.g. anatomy needs a bit improvement) - no intention to offend you here. But that's a quite good thing! very well done. I really love the effects you created there
maybe you should take the time to have a proper look at your picture if you sketch. or like, trying to delay the time you work on and making breaks in which you just look at your picture and try to figure out what you could improve. that's what I do... lol not sure if you do, but just trying to help here.