I can see you're working on depth of field but I'm not sure exactly what else related to composition you're working on. I agree about the background; it seems distracting and maybe even a plain wall could work for practice shots.
This reminds me somewhat of taking art classes and doing a study, where some objects were displayed and the purpose was to work on technical skills in drawing, like getting the perspective etc. in a drawing done properly.
I'm not sure what aspects of composition you're working on, but if you search Elements of composion in art (instead of photography) that should give you some sites with info. on the elements like shape, space, line, form, color, value/tone, balance. I don't think there's any quick easy way of learning composition as it involves a number of concepts that work together.