#51 is my favourite of your entries. Good colour scheme maybe the figure could be a little thinner with the lines and play with the angle of the circle. Some shading of the lines would add a depth as well
#52 love the more refined lines. I still think the circle needs to move towards the horizontal plane, and there needs to be a variation in colour perhaps a thin edge of blue on the yellow?
#53 a very striking image but the figure needs to be a bit more abstract/ androgynous and more colour we want a feeling of life, exerberance, happiness and relief