I used 2 different images that I liked from Firefly using the prompt "Stone Age mammoths and cavemen"
Then, in Photoshop, I cleaned the caveman up I took from one firefly image into the one with the Mammoths.
Then, from a stock photo, I add the food with a drop shadow.
Then I used the feature Auto-Blend Layers to have them all look like they came from the same image.
Finally, I created the sign in Photoshop and added that like a cherry on top.
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