Elements to avoid:
Mutilating or deforming the image, going out of frame, creating extra or mutated fingers or hands, poorly drawn faces or hands, creating mutations or deformities, producing a blurry image, having bad anatomy or proportions, adding extra or cloned limbs, disfiguring the model, creating an ugly image, having gross proportions, or producing malformed limbs, missing arms or legs, extra arms or legs, fused fingers, too many fingers, or an elongated neck should all be avoided.

Also, there should be no words, signatures, or letters added to the photo.