If you want that authentic R&B sound like Isaiah Falls, try using: chord extensions; triton substitutions; altered chords; and chord voicing.
You can create an exotic sound by using extension chords like Minor 9th, Minor 11th, Dominant 9th chords, Tritone substitutions, and Altered chords.
To create a more exotic sound, you can build your song in a minor key like E Minor but start your chords at the 4th of the scale, which will give you a Dorian sound.