add french curves, straight line rulers, and stencils just like real drawing or airbrushing techniques use to create tighter curves instead of shape creation then using nodes to create curve, because then you have to reshade or color plus among other things. I air brush with real airbrush and many times stencils and french curves are used also if you could refer masking as taping or somehow implement taping to cover areas in multiple spots at same time instead of separate masking; taping is done a lot in airbrushing.