Newbie seeking advice on leaf size?

looks like they are developing normally. There are things that can cause malformed or extra skinny blades (even if 'sativa' traits shown), but clearly not happening here. sometimes it's just genetics, but the escalation of number of fingers is also a good sign of a happy plants.. 3-5-7-9-11-13 ... should at minimum see 9-bladed leaves. Training can knock that escalation back a bit too. topping and lst can delay the increase in fingers of leaves off each successive growth node. stress in general will impedge that steady increase in fingers per leaf. people that fertilize poorly often only see 3-5 bladed leaves and the 2 tiny ones are often mal-formed or missing.

Depends a lot on genetics. Nothing wrong with those.

Looks good

Plants look very healthy, always use the leaves as first indicator for what you do to the plants and how they take it. Leaves should be slightly praying, that indicates an overall happy plant, stressed plants in what so ever way start to have droppy leaves, then other signs add up. If you watch your plant daily, you most likely can tell by yourself why they happier or unhappier than before. And if not, you can come back here and ask again. And for potential future problems its good to make a diary, so people that want to help can see the informations they need. PH, nutrients, amount of watering, how much PPFD you give for how many hours daily(DLI). All that helps people to help you, IF you one day will have a problem

Normally people try to stretch plants in the beginning by giving less PPFD than needed, but afterall its the genetic. When you have a indica plant, she tends to become bushy. I would definetly not decrease the light now, they wont stretch anymore now, just stagnate. They a bit too far that. If they stay bushy anyways, you can train them with a topping, but only if they photosperiods and not autoflowers. Like that they will take your whole horizontal space. For Topping cut the first node(always smaller than others, not worth to keep), then top after the 3.-4. Node, so your left with 2-3Nodes. On those branches you cut off the first 2 nodes too, so the plant got some space to develop. Then just let it grow, and take a few leaves of over time that grow inwards the plant and shadow stuff, or plants that just dont have space. Trust your feeling, but dont just take off stuff for no reason. In Flowering after 3 weeks you can lolipop your plant by 2/3 of their size( leave atleast around 30cm height of buds and flowers everything underneath can go, because is shadowed anyways and for your RH. Lolipopping means every branch that didnt reach the upper 30cm and leaves on that height have to go, your plant will look like a lolipop

Looks good bro what you want to know exactly they look fresh and super healthy, happy growing buddie :)