Maybe try adding the Portal 2 name into the prompt. I don’t use DALL-E as the FOSS solutions just give me so much control, but I suspect that the names Portal/Portal 2 and Aperture Science are in the corpus for DALL-E. I will have to test my SDXL setup to see what it comes out with. Are you able to use Controlnets with DALL-E? If so, it might be worth doing a basic sketch and having it fill in details.
I used DALL-E 3 via chat GPT interface, so chat GPT manipulates the prompt before passing it to DALL-E, but I put this into chat GPT:
Trying more specific descriptions about having orange portal behind her and having hands reaching out of the portal led to worse results…
Maybe try adding the Portal 2 name into the prompt. I don’t use DALL-E as the FOSS solutions just give me so much control, but I suspect that the names Portal/Portal 2 and Aperture Science are in the corpus for DALL-E. I will have to test my SDXL setup to see what it comes out with. Are you able to use Controlnets with DALL-E? If so, it might be worth doing a basic sketch and having it fill in details.