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From your gallery I like this one the most [Valkorati] , because it's very detailed, and you used very nice colors. The soft shining of the orange elements adds a few highlights to the whole body.
I think this is something you should always keep in mind while drawing: never forget to add highlights. In your favorite work it kind of bothers me that you only used a few dark colors, and not many highlights. It seems a little.. well.. drab?
And I think you should also try adding some shadows/3-dimensional shapes, on the background, but also on the creature itself. ([link] if you take a look… e.g. between the legs, on the stomach etc. are shadows. I don't know much about creatures, but I think they should also have a shading
You could also add features, like a shining eye, a light which shines directly into the trunks and highlights it. Also the bones of his body should have shadings to make clear how near the one / the other end of the bones is. Do you know what I mean? I hope my English doesn't suck too much
At the moment your scenery seems to be very flat. It kind of looks like the background is directly behind of your creature, or even next to it. That's because you always use only one lineart color, and because of some technique.
I would also vary in my patterns. Did you just overlay one single pattern above the painting? Its a problem, because the pattern on the pillar shows exactly the same size as the pattern of the background. It makes it look like everything is on the same level. So maybe you try to learn blending of your colors, this'll make your scenery look more realistic. Just don't limit yourself on a few colors.
And maybe you should try to give your creature and the room more place. Try to draw on a bigger resolution (I always draw in a resolution higher than 3000/3000) - maybe more width than height. So you can do a detailed creature, but still have place for your background (details) left.
I hope it’s helpful, and I hope you don't feel too overwhelmed. Please ask again if you have any further questions, if you're unsure etc., okay?