Something else to consider for this post and parent. Using photographic techniques to make a painting does not guarantee a photographic "look." If you look at Warhol's traced drawings, the only clue is an even, utilitarian line, he was clearly not interested in copying visual reality (or he gave up on it when he realized it wasn't that easy to do from a projection). As counterpoint to that, you can look at Ingres' drawings, which are a world apart (it's likely he used a camera lucida, judging from the small size of the drawings and type of line). There is ample opportunity for the artist to bridge the "technological" gap with their own effort and ability, and it's likely this would happen to different degrees.

If using unconventional tools is part of your assigning value to artwork/artists or not, is another question.