https://i.redd.it/wva0zdhu64ff1.png
Not sure if it's actually a wizard living in there - could easily be a necromancer, some weird extra-planar thing, or just whatever fits your campaign. The entrance works for most "mysterious tower" scenarios.
Thinking about doing more floors/rooms for this eventually since I had fun with the concept, but for now it's just the entrance area. Included both animated and static options.
If anyone wants them, link's in my Patreon post: Tater's Maps - Wizard Tower Entrance