New Post: Image type

Hi Rob
thanks for your reply, but I'm not be sure to understand well
I know to have a tag gallery [TAG:GALLERY1] [TAG:GALLERY2] etc
But my question is if is possible to add a field to the image for define one kind of particular image.

For example I have a product with 3 image and 2 sketch I'm interested to position the 2 sketch in a different way respect the gallery.
How can I find the 2 sketch? I think the unique way is to have a way to add a tag to one image.....

I hope to be more clear
thanks
Fabio