When Giorgio Armani was first shown Chermayeff & Geismar’s new logo for Armani Exchange (A|X), he rejected it outright. The designers later found out that due to Armani’s infamously busy schedule, the new mark had been presented to him between meetings, on a white piece of paper.
The A|X directors of advertising and branding, Tom Jarrold and Matthew Scrivens, then suggested approaching Armani a second time (which they almost never do) with the entire Chermayeff & Geismar presentation, which showed the logo in such applications as magazine ads, storefronts, and billboards. Once Armani saw the increased visual impact of the new identity in context, he immediately approved it.
A good lesson, from Chermayeff & Geismar’s 2011 book Identify.
Here are a couple of tools for preparing design mockups:
Also search for “design mockup PSD” or browse sites like GraphicBurger. A lot of the options aren’t great, but you can find a few timesaving gems from helpful designers.