The beautiful thing about art journaling is the wonderful product: gesso. If you don't like a page for whatever reason glop on the gesso and call DO OVER!
I'd been taking notes as sermon prep. I didn't like the notes I'd been putting down (& I hadn't like the too dark stenciling background that I was doing the note taking on). I called do over & covered the page with white gesso; added some watercolor stencils and started all over again.
The shadow of notes were still there but otherwise it was a fresh page and a definite do over.