Living rooms generally support larger statement pieces than bedrooms or hallways, since sightlines are longer and furniture tends to be bigger. A large marsh landscape or ocean scene above a sofa reads as a focal point, while the same piece would overwhelm a smaller room.
Coastal palettes rarely go out of style because they are neutral enough to survive redecorating trends while still carrying personality. A well-made piece also holds up visually over decades, since the ocean and marsh subject matter does not date the way trend-driven graphic art can.