How do you re-create sprites from blurry images that have volume?

[SpritZ]

Hello, I have a question.

How do you recreate sprite(s) from blurry images that have volume?

For example, the sprite-sheet from Mario Customs with the Super Mario World Beta sprites. That sprite-sheet was made by recreating multiple sprites from a image from a Interview with Tezuka-san, Hino-san and Nogami-san on the Nintendo website.

Can you please tell me how I can do this?

I wanna recreate these "Beta" Images from my search engine but its too blurry and I cant make out the pixels.

Do people scan the image? do they have some sort of trick?

I only have Paint.NET and Gimp. But I only know how to use Paint.NET.

Here are the links to what I'm talking about.

https://www.spriters-resource.com/custom...eet/97187/

https://www.nintendo.com/super-nes-class...ario-world

Another reason I want to do this is because I feel like every single idea is taken. And I want to help the website out without ripping, by making custom sprites. But I don't know much on how to do so. I would like Tips and Tricks on how to do Pixel Art if you have any.

I'm thinking about getting Aseprite, but I don't know if I will or not.