If you’re using the Mid-Century theme you may find that you don’t want every one of your image assets to appear in the photo gallery widget. It’s easy to limit the images that appear there using tags.
First, go to Manage Assets and select the images you want to appear in the photo gallery widget. Choose “Add tags…” from the “More actions…” menu and tag those images “gallery.” Next, edit the “Gallery.” template module
Around line 6 you'll see:
<mt:Assets type="image">
Change it to:
<mt:Assets type="image" tag="gallery">
Then you need to change it again around line 23:
<mt:Assets lastn="10" type="image">
Change it to:
<mt:Assets lastn="10" type="image" tag="gallery">
Now only images that are tagged "gallery" will appear in the photo gallery widget. Republish your site and you're good-to-go.