I want to delete a photo from an album and also from photostream

I use Photos to edit images of old photographs and also newspaper articles. I import them into Photos, clean them up and then export them to a folder on my MacBook. This all works very well, but I often times forget to delete the image from Photos. I decided to create an album and drag these images into that album. I went through a review process to make sure that I had indeed exported the image file and that it was stored properly where I wanted it outside of Photos. I then would select the image and do a Cntl-X to delete from the "review" album and paste it into another album that I created names "Images that can be deleted". That way, I didn't have duplicates between the 2 albums.

Now I want to delete the images in the "Images that can be deleted" album AND ALSO delete it from the Photo Library at the same time. I have searched and found various solutions, but I can't get them to work. When I delete the photo from the album, it is still in the Photo Library.

How can I delete it from the "Images that can be deleted" album and at the same time delete it from the Photo Library?

Thanks, John