How much code is necessary to be considered a copyright infringement from an existing code base? For example let's say I'll take a single frame of animation fr

How much code is necessary to be considered a copyright infringement from an existing code base? For example let's say I'll take a single frame of animation from a cartoon, The frame contains a mountain, house, and a couple characters although those characters are not integral to the actual cartoon maybe they're extras (villagers and not named characters something like Mickey Mouse for example) I draw a picture of a lake with a cabin next to it, then start to draw a frontiersman but I trace one of his arms from a villager of that previous frame of animation... Number one am I in danger of copyright infringement (have I hit some arbitrary threshold), and number two: am I causing monetary losses for the cartoon?