I'm not sure if it is the artwork or the message. The previous promo art had tagline "Vacation rentals and reviews" which targets a specific audience, while second artwork just says "Dwellable" which is more mysterious and so you might have more people download it to check it out. Maybe it helps to have a broader message to get more people to try it, but expect to have a higher % of those curious windoshoppers try it and then shelve it/uninstall it.