While retopolizing a model using Bsurfaces, shading has become a issue. In the screenshot below, is there a way to turn off lighting altogther so that I can see what I am doing? I am guessing the dark areas are because the lighting is from the other direction…
it looks like you have 2 or more faces sharing the same space where it is dark looking. that is called ‘z-fighting’ ( kind of cool term ) as for the visibility issue, try turning your shading to solid over in the tool shelf so you can see your base model better.