Nicely setup.
The tank is fairly new to have fish in them, this is because you need to establish the biological cycle so the new fish can survive in. Otherwise, your new fish may suffer (and I am sure your first fish will be the special ones). Also wondering how many gallons is your new tank?
It looks like a 29G, but I am not sure. Other than that, it looks very nice.
Platy will be a nice fish to add, you may want to look over some other ones also, like Zebra Danio might be a good bunch to look into. They are cheaper than platy and you can buy in school of 5 or 6 and from my experience I think they (Danio's) are stronger in tolerance than platy. Because this is a fairly new tank, start off with few fish and over-time add more.
Good-Luck with your new tank. I have been thinking of buying a new tank, but waiting till I get some extra cash in hand.
Take care.
The gravel that you used.....is it crushed crystals? I was thinking of buying those for a tank I am planning to setup, but someone told me they are expensive compare to gravel rocks. How much was the gravel to cover the new tank?