large window room creative poster mockup billboard mockup potted plants whiteboard design large window room creative poster mockup billboard mockup potted plants whiteboard design editable psd generative ai 4k resolution rgb color room interior window sill table setup indoor plants mockup template design presentation workspace decor interior design creative workspace room with table window view mockup design poster display billboard design room decor plant decor whiteboard mockup creative design room aesthetics design mockup workspace inspiration large window view table arrangement indoor greenery design showcase room setup creative interior mockup showcase workspace design room with plants design inspiration creative room mockup presentation interior aesthetics room with whiteboard window decor table decor creative mockup design room workspace setup