Please note, this guide is for users wishing to use the old system to edit their images. If you'd like to see instructions on how to manage your images using the new Images interface, head here.
On the page of the image you want to delete, just click on the Delete button in the lower left-hand corner:
You’ll be asked to confirm and then the image will be deleted from your profile and Store:
This deletion cannot be undone. Once deleted, the image is gone along with all its views, and if you’d like it back on your profile you’ll need to re-upload it.