Yes. If images pop up in your ad space or while browsing the channel on Intently, you can down vote either.
To down vote an image on Intently.com do the following:
1) Hover over the image and click the three dots in the top right
2) Click on the red trash image to remove it from your channel
To down vote an image while browsing the web, hover over the image and down vote it.
This will remove the image from your channel so you no longer see it.