No se que tiene que hacer lo que si te digo es que en este dibujo se nota que has practicado y se ve lo que estás aprendiendo me gusta muchísimo 😍

Hermann, in my limited experience, id probably say there isn’t enough contrast in values. It could be because your reference photo doesn’t contain enough shadows. I always either use a reference that has the darkest value and the lightest value so I can get good contrast which helps with depth. You could always alter the ref image, by editing the shadows, contrast etc. If you added more contrast then this would definitely pop out, good work buddy

Hey Hermann, John already gave you some solid advice 👍 I’d add that you should try increasing the contrast a bit. Also, focus first on building a strong foundation get the outlines and proportions right before going deeper into shading. You’ll feel a big difference once that base is solid ✏️😊