Also, you can't go wrong with a few more plants. I actually find more plants, silk or real, are ideal if you have the floating log in your tank. Makes it easier to pin the log in place, so the log won't pin your BETTA against the tank wall since the log seems to move around quite a bit when not pinned in place by plants.
His log is pretty okay as long as he doesn't go bump it around, there is no fliter and the way the roof of his tank is placed doesn't allow it to go to the edges. I know betta's like a lot of plants to hide in but I still wanted to give him room to swim around, he likes dashing around.
looks like your fish will have loads of fun darting in and out of those plants and no it is not too many i personally would love to have live plants for my four bettas but sadly i do not.... but it looks fine to me