How should an image url be in the api? Well it should be an object of urls images not just a url, so we can have different sizes.
Thumb (~32x48) /images/xs/1-a-bomb.jpg
Small (~160x240) /images/sm/1-a-bomb.jpg
Medium (~320x480) /images/md/1-a-bomb.jpg
Large (~480x640) /images/lg/1-a-bomb.jpg
"images": {
"xs": "https://cdn.rawgit.com/akabab/superhero-api/0.2.0/api/images/xs/1-a-bomb.jpg",
"sm": "https://cdn.rawgit.com/akabab/superhero-api/0.2.0/api/images/sm/1-a-bomb.jpg",
"md": "https://cdn.rawgit.com/akabab/superhero-api/0.2.0/api/images/md/1-a-bomb.jpg",
"lg": "https://cdn.rawgit.com/akabab/superhero-api/0.2.0/api/images/lg/1-a-bomb.jpg"
}