The basics are structure, perspective and form, specifically how to define form by using light and shading. It seems to me that this is what you're having trouble with, because the lighting on your creature is quite inconsistent, and the areas that
are in the light are quite shapeless.
It basically comes down to this; every subject you draw, no matter how complex can be broken down into basic geometric shapes. Cubes, spheres, cylinders, cones and so on. If you don't know how to properly draw these basic geometric shapes in a certain perspective, or define their form by using light and shading, you will most certainly not be able to do so with a much more complex form. Look up Andrew Loomis' "
Successful Drawing", it covers these basics very well. Good luck

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