[Image: http://i.imgur.com/tilLyWe.png]
Generally when you resize an image to be larger, you lose image quality since you're scaling the pixels so it looks more fuzzy the more you try to change an image's dimensions. It's similar to zooming in on things; it'll look less unrefined the more you magnify it. This is why artists tend to draw at high resolution canvases, so they don't run into the issue of needing to make their images larger.
Other than that, I'm not sure on what you need help with.
how do i keep the image the same size or enlarge it even if it gets pixelation