its a good painting, but i see edges are curved in the section of the knifes. Try using layers and organizing them with names. First layer, skin. Second layer claws. If you experiment with layers, i assure you that your paintings will improve ! Try looking up tutorials for speed painting or concept art and try to understand why they do such techniques. Some artists explain very well on how they paint. Remember that there is a reason why the line is there, surely not for fun XD Hope it helps.