I am struggling on to where to plant more plants as don't want to plant it to densely as I still will need plenty of room for the fish.
Also how close should i plant the plants together as im scared that some will shadow some others or will over take the smaller plants or would they be ok? Sorry if its a stupid question its just this is my first planted tank.
Hey Toria, why don't you give this a read?
Basics in Aquascaping
Since you're just getting started, I'd pay more attention to the general basics. Don't worry about the golden ratio and from what I see, you've got a triangle scape going if you use your wood to advantage. Also, look at the final height of plants to decide placement. That vallis may look small, but maybe it grows to 2' later.
If you have any questions about what a plant will look like when it's grown some, let me know.
L