The question isn't how many you can fit in there and get to survive, the question is how many will it take to look good while still balancing the tank. The more fish you add the more problems you are likely to have with algae, so I like to keep my fish load very light. If it were me, I would add half a dozen small fish like tetras and some shrimp such as cherries and amanos.
Also, as was previously stated, you will get way more mileage from that microsword grass by spreading it out throughout the foreground. You could also increase the density of the plants in the rear quite a bit and it will only improve both the appearance and the beneficial effect on the water parameters.
Welcome to the freshwater planted hobby! It is definitely different than saltwater and reefs but it is no less rewarding when you get your tank just the way you want it.
Two 1 GA desktops, a 5 gallon, a 2.5 gallon, a 10 gallon, a 20 gallon, a 25 gallon, and two 75 gallon tanks, all planted.
I am an expert on algae, so ask me if you have questions. I know how to grow it, just not how to get rid of it.