Hi Ton,
Some things I do when working with piano (I mostly use 2 mic-positions):
1. add MIDI-compressor for the note-velocity
2. add some EQ and cut frequencies I do not like / change characteristic of the piano
(3. mix the two mic-positions in a group channel)
4. add a little compression
5. add good IR reverb (in my case MIR; experiment and try different positions / settings)
6. add EQ (mostly to remove just a little the low-frequencies from the sides of the stereo field
[7. mix everything and master]
Best, Ben
Ben@VSL | IT & Product Specialist