Whatever design is chosen, I suggest it look good at varied sizes. That may mean paying close attention to color contrast as the size reduces. I did a variation of the prior one I commented on to show the image changes as it reduces in size. In order to make the image content clearer, I had to remove the glyphs and text and change some background colors for better contrast, for example. Colors would likely be different. I also created only a rough image for comparison and discussion purposes. I’m not a graphics artist.
Using the former base image, it would seem that the background color (orange here) should show through the portal middle “open” part, not use a different color (as is used below).
This is a concept only, not a suggested final. … Some things to keep in mind.
Also, we could use text with larger versions, then omit that area for smaller sizes. Legibility is a key.