When I render my model in Cycles (I applied a dummy material just to check), there are some bad/glitched shadows in some spots.
But, in shaded view (smooth shading applied to the whole mesh), it seems fine:
I checked the face normals, and they're fine, vertex normals look fine too:
This is a retopo of a sculpt I've made, it might not be perfect but there are no triangles or n-gons. It's also strange because those darker spots are triangular. I also checked if there were two faces one over the other, but there are none. Everything looks fine.
I don't know what may be causing this, any help?
I think I should point out that this happens on more than one spot and only when the spot is in some degree of shadow. If it's lit it looks fine.