As a Roblox developer and player, it is currently impossible to wear various brick colors listed on the developer site as skin tones on a character. An example of some of the colors I am referring to:
Additionally, skin tone is always restricted to the set of brick colors given by the Avatar Editor, and can’t be freely picked from a color wheel.
If Roblox is able to address this issue by adding more brickcolor values to the editor, it would improve character customizability, we’d have a further range of colors to choose from to match accessories and it would open up even more creativity in character design.
Furthermore, another idea that roblox could use in the future is the ability to select a color from a color wheel or color bar. Studio already has a feature similar to this while choosing part colors: