large white canvas dark room illuminated ceiling concrete floor concrete wall large white canvas dark room illuminated ceiling concrete floor concrete wall white wall generative ai rgb editable psd 4k poster mockup billboard design stunning mockup canvas poster room lighting ceiling lights floor design wall texture mockup template canvas display room ambiance interior design visual presentation digital mockup high-resolution mockup creative design art display modern interior graphic design advertising mockup branding display realistic mockup professional mockup marketing template design showcase artistic presentation visual mockup room decor architectural design interior styling design inspiration mockup creation visual aesthetics design elements creative showcase design portfolio mockup editing design customization