In photoshop when you airbrush a picture should you duplicate the layer first?

by thesqueedler Question by PicturePerfectxx: In photoshop when you airbrush a picture should you duplicate the layer first? i’ve been looking at different tutorials and some say not to and some say to. i’ve got it down how to airbrush just not the duplicating. Im using Photoshop CS4 if you need to know that. Best […]