I scaled up some pixel arts in AE and rendered it, but it's bluery.

 
I resized separate layers individually. When I chose 'Draft Quality', it looks perfect in AE, but after rendering they got blurry especially the layers I enlarged a lot. (I rendered the project in MOV/quicktime in AE, went to Premiere Rush and exported it in MP4.) Only enlarged images are blurry. Is there anyway I can keep resolutions when I resize objects?