I'd like to learn

[Vipershark]

But I don't want the sprite resized. I only want the uploaded picture bigger so you can see the shading I did.

You don't really have much of a choice since you have to preserve the quality.
The best way to show things at a bigger size is to put both the original 1:1 sprite and a scaled-up version on the same canvas.

(Watch this in fullscreen.)
(Sorry this is so quiet, I didn't realize my microphone was turned so far down until after I finished.)

Results in this.