Hey pal. Overall she looks healthy. I can't tell without a diary but with the cracking look on the dark green it looks like u went heavy on the grow and the lower leafs are PK defs marco nutes, (mobile nute), PK gets sucked from old growth to support new growth. Same can happen with N. This is just PK, showing signs it's moving into the stigma, (flowering phase), or just moving on. I cant see your nutes, focus on bloom now that shes moving into thr flowering phase, or is about to by what im seeing just in your pics.
Good luck!