Second picture way way WAY better. Aqua scaping isn't suppose to look organized or planned. Some of the best scaping is done without a plan. The plants look randomly placed like in the wild. The first picture looks too "thought out" and "placed"
Randomness is good in an aqua scape. You don't want your eyes drawn to one section of bunched up plants which I think you also nailed in the second picture. I say GREAT job!!
Second picture IMHO
you've nailed the natural look and beauty of a natural aqua scape.
Of course this is just the Con's opinion.