Another new paper puzzle type! I pondered the concept of shading an area so that the area’s shape or size is the relevant thing to consider (similarly to how e.g. the Snake Eggs genre works) and while doodling in my notebook I eventually landed on this idea. It’s very abstract but seemed somewhat neat. All three puzzles are probably really tough, though!
(Updated)
(Updated; huge thanks to Deusovi for an elegant fix!)