After seeing the first submissions what I see is most designers are playing with the letter E and the word Extramuros, but not making any references to the fact that this logo will represent an art gallery. In some cases it seems like they are pre-designed ideas that you are adapting to the project. I don´t mean you have to draw a brush. It has to be subtle but it has to have something to do with the fact that it will be in the Art world.

I´ve uploaded a sketch to the brief. Something to do with a wall breaking.