Hello Ardeus,
just started cycling my WB20 after being away from the hobby 10 yrs. Any input of what could improve my scape before filling cube with critters.
It looks good, but depending on the type of corals you will put there it may be too full already.
If the left rock isn't supporting anything, you can try moving it close to the front glass. The idea is to have 2 structures and increase the dramatic effect of the overhang on the right. Don’t be afraid to put big structures right in front.