There's something weird about this. Like parts of it are 3D or photography blended with 2D.
There's outline missing on the arms, possibly to make it like they're not in focus, and shading not done on the right leg.
Like...Mordred's hands legit look like they were made in one of those 3D model engines, and I'd bet money on the man's forearms and hands being from a photo.
It could be that the artist indeed used those things because he's bad at drawing hands.