Hi u can find the all resources in axapta as follows.
To view the available resources, open the Microsoft Dynamics AX menu, click Tools, click Development tools, and then click Embedded resources. The Embedded resources window opens. The window displays the available images, and the Resource ID of each image.
i.e SysImageResources form.
As of my knowledge ,the application is not allow to add the new image .all the images are saved in the kernal.