Hey fisilk! Thanks for the question,
for this model i do all the modeling within SketchUp, i pose the character and setup the camera in SketchUp too. At the time of this model i used Vray for rendering. Than i get the image channels and put them together in Photoshop! The dark and white lines comes from SketchUp ( dark lines are profiles, and white are the lines) if you put your model in view>face style>monochrome and set the background to be white, you can export these lines to Photoshop!