Yes you can!
If you want to remove pictures from your experience (this will not delete them from your general gallery, it will only hide them from displaying on the experience), click on the 'x' on the upper right corner of the picture.
If you want to permanently remove photos from your general gallery, follow these steps:
Click on 'Find your photos in your gallery'
2. Click on: 'Edit gallery'
3. Select the photos you want to remove and click on 'Delete permanently'