We don't have individual trees here at WikiTree, Candice. We are all working on a single tree, with one profile for each person in it.
Once the merge is approved and completed, there will be a single profile for Elmer; you and Brenda will be co-managers, and will need to collaborate on the profile if she becomes an active manager again.
You will be able to set your photo image as the primary image. You should, however, also retain the headstone image.
WikiTree is a collaborative site; we share our work. If you require control over your content, you should not add it to WikiTree.
If you find disinformation on profiles and have attempted to correct it but are receiving no cooperation from the other manager(s), you may need to request intervention. Visit the Problems with Members help page for more information in this regard.