I found a surprisingly useful tool for image searching.

In the case that the image is too small, you can upscale it using [url=http://waifu2x.udp.jp/]this particular API-driven website.[/url] So let's say I got a pretty small image.

[url=http://static.zerochan.net/Gekkan.Shoujo.Nozaki-kun.full.1832779.jpg]This[/url]

Now, if I upscale it by 2x and use either medium or high noise reduction, I get the following instead:

[url=http://i.imgur.com/2ie8cM1.png]This 2x[/url]

Theoretically, this can actually expand images I can use for wallpapers, and it can also provide higher res versions of likable images that seem pretty small. Try it out yourself.