In the left side of the picture, the belly blends too much with the sky, like the value contrast is too low, so putting lighter or darker clouds in that area could help distinct the character from the background. Also the neck seems oddly bent, too massive, and out of perspective, especially with the tiny arms, I think what could have helped would be turning it's head to be facing the viewer, not sideways, and reducing the thickness of the neck around the part where it bends (because creature necks are often kind of flattened on the sides)