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They are getting blurry because there are rules to resizing pixel art. You can try this site to rescale the sprite sheet without quality loss :

Thank you! As I said, I was sure it was something I was doing since I have no experience with pixel art. Plus, I can clearly see the example is bigger without being blurry 

Also, is it ok if I modify him to have wings?

Yeah, feel free to modify the image :)

Thank you. I'm so happy to have him for my stream :)