Rockstars/twinkle toes/glitter toes/whatever you want to call them, should be completely smooth, as smooth as a normal Shellac application if you are using a normal glitter. Chunky glitters can feel a bit more textured and require 2 topcoats, but should then feel smooth after the second topcoat.
If your toes are feeling rough after the topcoat (or 2nd topcoat for chunky glitter) then either you have put too much glitter on, or you're not scrubbing it into the tacky layer then brushing the excess off thoroughly enough. Really scrub the glitter in, then brush it thoroughly to get all the excess off. If you do this then topcoat you will get a smooth finish :Love: