Probably the simplest and quickest approach is to listen to a lot of recordings of artists playing the styles of music you want to emulate.
The main ingredients are how the note(s) is/are attacked, what they do with a note, when they do it, and how they release the note.
I notice that when I do this I unconsciously picture a performer in my mind and hear it in my head while trying to get the spririt of that type of playing.
Then of course being that we are playing an arranger keyboard, the next thing is to work with what we have and do what is convenient. Some things like wide open guitar harmony may sometimes be difficult or other such things, so you may have to comprimise a bit so it can work smoothly and effectively for you.
Best
Scott
www.ScottLMusic.com