I absolutely love the details in the flowing cape and dress, the neck adornment Arwen is wearing, and even the delicate flow of her hair and gesture of her hand
As noted below, Bandit Keith wears the Union Jack instead of the American flag to match the change in settings
I can understand the impulse to use a fake $5 Underground Sea when the only other option available (thanks to the Reserved List) is a $2,500 playset of Underground Sea
Character poses can help a cards effects look nicer
Onto more personal opinions, while I dont exactly like Secret Lairs all around, I think a crossover with Arcane (or League of Legends in general) isnt a terrible thing
The fact the Monkey Pirate has Dash enables you to do something on turn two, create a Treasure token, and you can play an opponents card