Just my 2 cents worth. I think it might have a bigger and more interesting impact if you had multiple pots of the same plants together...like planting enmass when planting beds where you have 3, 5, 7, etc. of the same plant. Another thing is that most of your plants have very dark foliage and are in dark pots, so the foliage sorta blends in with the pots rather than it showing off against the pots. Additionally, I think if you had grouping of 3 or more pots and then plant in the ground something low growing between the pots, but not all the same type of plant...vary it for interest.
