The cory cats should also be schooled if I remember correctly. Your female guppy probably won't have much hope as the two males will most likely wear her out from their constant wanting to mate (This is what happened with only one male and one female in my tank). Don't add any other fish such such as the disc gora or the glassfish (I have two of them, and I think they like to be kept in pairs or groups).
If I could recommend something, I would say go with atleast two more danios, one more neon, and two blackskirt tetras (In the wild, different types of tetras won't school, but in an aquarium I think they might). All this is if you have more room for fish. As it looks right now you seem to be pretty well stocked, and I wouldn't recommend getting anything, perhaps you can take something back or get another tank?
What might help is the addition of live plants. I believe if you keep live plants it separates the tank more, and helps oxyginate the water so more fish can be kept. I have live plants in all of my tanks and the water is very clear and it looks a lot nicer with them.
I'm just thinking this stuff off the top of my head and you would probably want to check with some of the other members here on what they think.
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