It looks to me like you should flip the placement of the amps and the battery. You have a lot of extra cable running to the battery especially the ground wire wich should be much shorter. Also it appears that the RCAs and the power cables cross at some point and this could cause some interference even if you have really good cables. Is that a second battery in the trunk or your main/relocated battery.
The install does indeed look clean but those details might help you out in the long run.
