I think that many fish would be pushing it..
I wouldn't keep any small schooling fish; they get very lonely if not kept it large groups and the tank doesn't seem big enough for a school. However, your tank seems perfect for a betta, a pair of african dwarf frogs, or a snail

Ghost shrimp are okay too, and since they produce very little waste, your could probably keep three or so with any of the others I mentioned, but they might be eaten or picked on by bettas (possibly frogs too?)