Sup.
I was looking through your posted images and wanted to say that you're making a good job with the shading and you're using help lines, which can make you go far, with some practicing
But I must notify you at some points.
First off; draw a stickman for your origin for your image. This will make it easier to manipulate a natural stance of the creature you're drawing.
Second, the second image character got some roughly shaded spikes (or is it spikes?). I mean that the shadows are gathering at the same side (which shouldn't be a problem if he held his arms straight horizontal). You should redo the shadows after where you've put the 'light source' of the image.
Third, the third image have a quite large resolution and makes it impossible to see what it is when you enlarge it from the forums.
fourth and last, try to reshape that dragons head. It looks quite round.
I apology if I was to harsh with this critique, but as I told you earlier; if you keep practicing, will you become something for sure.
I do also want to recommend you to check out
this website, where the most famous artists of blizzard are uploading their artwork. Check the website for some insperation and how you could improve your drawstyle.