Both great pics. I like how you shaded gatsu face, that looks like an interesting method. Wellll, its a better Guts than I've ever done, but for recomendations I'd say perhaps slighly round out the lines of his face and jaw and go a little bigger and spikier on the hair. I think on the left some upward spiking hair would look good. The facial features are awesome though and the overall work is very impressive