Yo dude, I'd say it looks fine enough to me - the leaves look a little hardy-ish already, though that's probably due to low humidity only just toughening em up abit early. Plus next to fresh new lime green growth it'll look extra contrasted anyway. To save on dehumidifier, you could always pop in a propagator for few days or build DIY cling-film prop over top of pot, though it looks past the fragile seedling stage of caring too much now anyway, though never hurts to go gentle with sativas.
Pot and feed wise, if the soils anything light or above then if me I would still water only for next couple weeks and wait before nutes, and i always like to let them get to few nodes high in seedling cups before transplant, so rootball builds up bit bigger - that is personal preference though and dependent on what plant saying to you anyway. Be cool to see how it grows!