Even VerMeer used projections. To be honest, I couldn't afford a real projector so I bought an old overhead projector (this is where people shudder at the memory) for $5 and bought some transparency sheets on Ebay. I traced the outline of my dog
Then I projected that onto a canvas and traced the outline. I had some guilty feelings at first then I decided that since I'm not an expert it would be ok. When I read that other real artists did it I didn't feel so villainous.