With that question you get a lot of Germans into a jam. Me too.
I can only try.
Bild is the most general word for anything that gives a visual representation of
someone or something, just as English picture. A Bild can be a painting on a wall or a photo in a newspaper or a child's drawing.
Abbildung is just a variant for Bild. As it is much longer you won't hear it very often in spoken language. In books that have a lot of photos of objects you can find the abbreviation Abb.for Abbildung + a number. Abbildung is mostly used for pictures made with a camera, not for paintings or drawings, a mechanical reproduction of an object.
Abbild is another variant of Bild. Not frequently used. I can't think of a typical situation where I would use Abbild. Actually I think you can forget Abbild and Abbildung in your active vocabulary. All you have to know is that they are variants for Bild.
Another variant, used only in religious context and the sentence: Der Mensch ist das Ebenbild Gottes (Man is the image of God). The old word element Eben- expresses the idea of similarity.