Yes, you can delete your photos in the gallery: hover over a photo, and click the trash bin in the top right to delete it. Deleted photos are permanently deleted after 30 days.

For models it's the same, go to the top left model selector at "Select model", and hover over a model, in the top right of the model click the trash bin to delete it.

If you cancel your subscription your data is completely deleted after 90 days.