And yes, both of these shots are photographs.
FasionablyGeek explains that:
Cosplayer Kirameku is working on a Nisha the Lawbringer costume, and she decided to make the jeans look cel shaded just like they do Borderlands. These pants look like they’re right out of the pages of a comic. She painted over denim jeans with a mixture of Textilcolor and water. She did an amazing job adding the highlights and shadows, and we can’t wait to see the finished costume.