It is a gift to see that you actually know music theory.
Your next step is just the electronic aspects.. I think one example I should point out is in Missing, I really liked how you used the piano and those pads, but the piano was clearly a synth (probably FL keys right my dood?) since I could hear the LFO hahaha
You might want to consider adding some reverb and delay, just some minor mixing effects, that will make it instantly sound much more realistic, and also give you the desired feeling from a quiet piano track. After that just consider some minor EQing and your piano will sound great. [:
Would really like to hear more from you, especially with a lot of nice mixing effects... haha