As far as I understand, you have a RelatedData field in one of the module subtypes, which you use to store an image/images and the parent type relates to this subtype. You want to show the subtype Image field into the parent type template. If this is right, you should go to the parent item template from Design -> Widget Templates and choose the template you want to modify. Then, from the right Sidebar, select your field
that you use for the RelatedData for your subtype. In the item template of the generated snippet, you should insert the snippet for your RelatedImage field of your subtype. Go to the Widget Template of your subtype module and from the right sidebar select the RelatedImage field and copy the generated code
. Insert it in the above mentioned place and now you should be able to see the image from the subtype.
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