WOW ... "better" ... can't tell what point you are at and how much space you have to work with... so....
my random suggestions:
mark off the space you have within aquarium, leaving space all around for cleaning glass, etc - this space is marked off OUTSIDE aquarium where you will dry build/fit your aquascape. You could use inside a box, so you get the 3D effect of your walls. We do our markoff area just with blue painters tape on scrap board
Now, limited only by imagination, as if you don't like first try, then try again. Dry fit your bits.
For imagination tips:
look in this sites Forum area for Member Aquariums at others with your size tank
put keyword search in google for: aquascape aquarium ideas saltwater
I think being a good aquasaper is kinda like being an artist....you either have it or you don't. If you don't, then you copy...which pretty much anybody can do by looking at pics and duplicating