I like it! The only tip is if that this an above ground mountain (floor 7 and higher), I suggest removing the lava and just making fire fields like you have.. for no reason should lava be on floor 7 unless its like an island of lava. The only time lava should be used is in an underground spawn. And if its underground.. just keep at it and do what your doing! If its going to be a mountain that is placed on floor 7, change that lava up, simply just make it mountain ground with fire fields like you did on the floors of the mountain and just use water and grass bordering around the mountain if its a landmass. Unless your doing a lava island, like I said above.
Anyways, keep at it. This is very good for your first map attempts! Start to develop your own style, and make your own unique way of making stuff and you'll be good to go!