Looks perfectly fine for a young plant. Difficult to see color of leaves etc... but if oyu see any minor blemishes, that's normal for the first couple sets of leaves.
As far as size.. that's all genetics assuming you don't inhibit it. Keep it healthy and watch. That's all you can do. Autos need less ferts, in general. Keep eye out for darkness rising from lower leaves. That's a sign to dial back a bit, maybe adjust feed down a bit when you resume regular schedule.
You don't want large internodal spacing. As long as it's popping out nodes vigorously, all is good. If it stretches move light closer. Don't worry about the height so much. Number of nodes is probably more correlated to yield. I have a ~3 week old plant and has about a 3-4" stem before 4 nodes begin, because of an egregious error by me. It is artificially tall (donor area pic week two, lower right plant). it's just a donor plant, so no loss.
So, keep eye on growth. It should continuely increase exponentially. If it slows, that's a sign of an underlyingn problem.