These are all good for a beginner, but clearly could be improved upon.
No1: look at the right side of the picture - do you need all this in the frame? What is the idea of this shot? If it were a horror book stand and you would trim the right side so instead of BOOKS we could read BOO , then there would be at least some funny side to it.
No 2: look at the left side - do you need that poster on the wall and so much empty space? What is the main subject?? Again, what this is about?
No 3: Again what is all that clutter on the left? Can we live without it? And what 'moment' exactly have you captured?
There is a lot to criticize, but at this stage I think it is not really necessary. What is important at this stage - you have to be able to explain clearly , what exactly have you captured, what this moment is about and why should it be interesting to other people?