How large is the tank .. a 10gal? It looks like the plants and DW I see is a background?
Try some low light plants and (more)DW ... you'd bee surprised at how much fuller your tank will look with live plants, DW, and rocks. You could also add some small schooling
fish like Neon Tetras ... they stay small enough that a school of 10 will not overwhelm the tank, but will help give a more full look.
75g Planted Barbs Denison, BlackRuby, Tiger, Albino Tiger, Green Tiger, Cherry, Gold, Checkered, Odessa.
NonBarbs Cardinal, Neon, RummyNose, Bloodfin Tetras, Z. Danios. 1RTS. Amano, Bamboo, Ghost & RCS. 20g Long Shrimp Tank RCS, Tiger, Amano.