Savanna subbiomes

I think the savanna biome isn't so realistic. It would be cool if there are more 'subbiomes' added, like there is bamboo in the jungle. For example baobab savanna, savanna bush, plain savanna and tall grass savanna. On the picture I've built baobab savanna (left) and savanna bush (right) . I hope you like it ;). The bush savannah has got bushes on the ground just like in the jungle. Maybe they could be the border/transition between jungle and savanna?