Why are the unwrapped UV faces different sizes and proportions to my model's faces? Hey so I'm fairly new to Blender and am having issues with some of my UV unwraps. The lines in the UV Image Editor are making completely different shapes. I've tried multiple things trying to get them to be more uniform with their model but it still isn't working. Not sure if it's how I'm doing my seams or something else. Let me know what you think.
You can try to use a front orthographic view, select some faces and choose U - project from view. Then change the view and go on with other faces, until you unwrap the whole model.

The classic UV algorithm gets confused by your convex Ngons, a clear topology, with only not convex quads, would avoid the problems.