Next to the red house, there is an empty and abrupt corner, across from the lamp post. Try and do something there, plain corners like that can lead to a lot of empty looking space in game.
If you can help it, try not to have such straight paths.
If you go on trails or walk paths in the real world, they are never just straight like those paths.
Here is a map of Pallet Town I made somewhat recently:
As you can see, the path looks more rugged. It gives it am or natural feel. When the player walks along those, they also do not feel the need to follow it exactly, because they can still be on the trail.
Also, try to pick up some ruffled grass tile to help busy places in the grass where there are not flowers. It helps you from overdoing the flowers or rocks while still letting you keep things busy.