Hi Jennifer and thanks so much for your feedback. It's a bank holiday here and I'm about to head out with the kids for the afternoon; with the 'open' phase of your contest about to end, I'm not going to have the opportunity to give this the thought I'd like.
I've introduced a green triangle into the 'doorway' in entry #35. This is meant to represent an arrowhead in perspective pointing into the open space.
I'm going to submit another design in a couple of minutes, which includes an arc. I'm afraid I won't have time to submit any more before you enter the 'top 5' phase.
Kind regards, Steve