To be fair, shrimp are fascinating to watch just all by themselves. Not sure about other species of shrimp but cherry shrimp seem to grow amazingly quick. Only had mine about 3 weeks and the increase in size is phenomenal. Pretty sure one of them is carrying eggs now too.
The rock and plants look great, so add more to the bits that don't have it.
Some taller plants at the very back.
Remove a little of the plant mass covering the rock.
Hide the substrate at the front with some more of your lovely rock!