How to improve livery quality(stripes being pixelated and such)?

Hello all, as the title suggests, I am new to skinning and such, so I would like to kindly ask for your help in improving the quality of skins. I do have both 2022 Photoshop and Paint.net installed. Thank you kindly. This is a small screencap to explain the basic thing I'm asking if my english doesn't allow for it to be understood.
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