analog ground and digital ground question
The grounds at the power supply subsystem want to be the digital ground plane. Group all of your analogue components that have the analogue grounds into an island ground area that then connects at one point to the digital ground. Place the filtering ferrite bead component that you isolate the digital power from the analogue power directly over the single point connection between the grounds.

Your picture is somewhat misleading because you just show the ground connections of the filter capacitors. You should also show the ground connections for the DC/DC, LDO, Op-Amp and CCD.