You'll need to have a higher resolution image to do that.
Go on google and ... lol ... search for "squirrel big nuts"
and change the image size to large instead of all sizes.
A small resolution image will NEVER englarge without
being pixelated, despite what CSI tells you with it's
bogus ENHANCE feature.
Hmmm a blurry shot of a man running, quick, ENHANCE,
ENHANCE, ENHANCE - take his license out of his wallet
and read his address - ENHANCE!!!