Helzon@- really nice sketch, something I always notice with your work is that you have some trouble when it comes to the color making most of the images have this kind of shinny shell effect and the contrast is the same all over.
I think you would benefit more if you tried to vary your textures and lighting on the creature as well as focus detail on one area, fading the saturation and details on lower portions of the creature that might not be so important. You can still add detail but just push it back further by making the colors less intense and lighter so the bulk of the detail, contrast and saturation fades to the areas that are of more importance. It will bring a better balance and make it easier to view the creature without it becoming confusing.
Same goes for the poses of the designs since some of your creatures have a very strange far out design that sometimes is hard to see because elements overlap with the same amount of texture and detail. This creature is looking good, as I can see your getting better just try to make things more visible for the viewer.