1. An image processing system, comprising: an exemplary combination data storage that stores exemplary combination data related to exemplary combinations of color information; at least one processor; and at least one memory device that stores a plurality of instructions, which when executed by the at least one processor, cause the at least one processor to operate to: obtain color information of an attention point or an attention area within a target image, the attention point or the attention area being set based on a point or an area within the target image that is specified by a user; obtain a photographed or drawn image of a subject whose color is the same as or similar to a color indicated by the color information of the attention point or the attention area, from among a plurality of images stored in an image storage; cause an output unit to output the obtained image; determine, based on the exemplary combination data, whether or not a combination of color information of an image stored in the image storage and the color information of the attention point or the attention area is one of the exemplary combinations; and cause the output unit to output a notification if it is determined that the combination of the color information of the image stored in the image storage and the color information of the attention point or the attention area is one of the exemplary combinations.