How do i amke a High Res portrait mod?

Grimrana

Newcomer
I'm using portraiture to make pixel art portraits, but decided I want to try making them high-res and unique like in DC burger. the issue is that the canvases are too small to get something high res that works, and I won't be able to draw clean lines on them. Do I take the files and resize them for drawing, then size them back down? how do I do that while keeping the quality?
 
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