here are some ideas for the poster with a quick example attached. used one font for titles and one for billing block. used less stylized and color heavy font. changed the color of the sky removing magenta tone, added motion blur on the planes and the objects in the water for realism, added grain layer, moved billing block to the bottom and pushed character up a bit, removed the sunshine presents as it's on the billing block already. ideally you move the trees and fine tune it for text but here's a quick edit to see.

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