1. A system for controlling a combustor assembly, the system comprising: a combustor assembly comprising a combustor and a fuel nozzle assembly, the combustor comprising a casing, the fuel nozzle assembly positioned at least partially within the casing and comprising a fuel nozzle, the fuel nozzle assembly further defining a head end; a viewing device facing the head end and configured for capturing an image of at least a portion of the head end; and a processor communicatively coupled to the viewing device, the processor configured to compare the image to a standard image for the head end.