The original line art was done by Mary Ngai of DeviantArt. All I did was vector the lines to give it a solid look and initially apply flat colors. Only after the flat colors were done, I changed the colors to B&W to emulate the look and feel of an actual inked line art.
Seraph variation of the Locomotive type “wings”. Enables user to fly, which gives the Valkyrie height advantage, but also makes her an easy target unless she has expertise in maneuvering.
Here’s a quick comparison of the original line art by Mary Ngai and the flat colors that I did in Illustrator: