Something is short if the highest part of it is much lower than the top of similar things. The woman in the picture is much shorter than the man in the picture. The opposite of short is tall.
Something is shredded if it has been cut into small pieces. Usually the pieces are strips that are longer than they are wide. People shred vegetables to make salads, and they shred paper so that noone can read what was written on it.
The person who took the picture does not have a very good shredder, as some of his paper shreddings are very readable.
Something is simple if it doesn't have a lot of elaborate parts, or is very easy to understand. The picture is of a very simple flower arrangement.
The opposite of simple might be elaborate, complicated or difficult.
Single is used to describe just one of something or someone. For example, if you're not in a relationship, you can say you're single.
