Honestly, I think your obelisk placement is fine, Something about having a cluster of them like that makes it kinda cool like "oh this is my teleportation hud" The two fish ponds on the far left was also a really nice touch I think! As for what to do with the leftover space, a mill might be a good addition, especially in that empty area in the center of the map, even if you don't use it to make things aesthetically it might look nice. or maybe stick the obelisks there in the middle so that they're easier to get to if you wanted to get to them after tending to your animals? Also since you have quite a few beehives, maybe try to do some flower areas both for the aesthetic and the flavored honey?
I really do like your grass and the paths you choose! It really makes the farm feel cozy!