This is one astounding piece of art! I love the creative use of colours you have in the artwork, and all the texture, shading and effects are top-notch. And that's just an understatement.
What I truly loved in your artwork is the way you've smudged certain parts of the picture to create the illusion of movement with the character using her arms to summon magic, and the giant monster behind her, about to strike. It can be quite quarrelsome to be able to master this effect, and I think you've done it greatly, if not perfect.