Visuals don't need to be flashy. They just need to be clear.
Walking into my usual go-to for a home cooked Japanese lunch, I noticed that the owners had put some diagrams up on their signs. For those of us who speak Japanese, it is obvious what an “Una-don” is, but a pure question mark for the rest of the English speaking world.
These diagrams were simple but communicated the point: their version of una-don contained grilled eel, some sashimi and other toppings.
A similar diagram was seen on the bento as well. They obviously get asked what’s in the bento often enough.