Question to all the Artists - Hand-drawn art!

[Joshinator]

Alright,so I've been getting into art lately and am currently using Paint.net,Yes I know its pretty un-professional and is mainly only used for editing.

But,I was wondering how do you get better lines,for example every line I draw seems to pixelated.

Heres a preview of what I'm talking about:
https://gyazo.com/18b0a536b99392238646322121a9e8e4

 

[Candy]

Bigger pictures
Like dont use 64x64
But instead 1920x1080 or 1080x720

 

[Joshinator]

Thank you Candy!

Bigger pictures
Like dont use 64x64
But instead 1920x1080 or 1080x720

 

[Rainy]

Bigger pictures
Like dont use 64x64
But instead 1920x1080 or 1080x720

also use anti alasising on the brush or pen tool or whatever you are using.