Ah, I am pretty sure that the instructor means to take more creative risks. If you don't know what that means then this will be a great assignment! I have heard writing instructors make similar admonitions.

It is too easy ... and "safe"... to take the kinds of photographs that you know will be accepted by most of the people who see it. One of the common ways that photographers fall into that rut is outright mimicry of shots that they know will be accepted. Another way is to conform to compositional "rules" such as:

-rule of thirds
-the more sharp detail the better
-unwanted distractions should be dissolved into blur
-shots should be level i.e. vertical lines should be perfectly vertical
-don't over or under-expose
etc.

Just try to take some shots that nobody has ever seen before. Make your instructor say WTF?!