“Rough layouts sell the idea better than polished ones.”
You (and perhaps your team) have been toiling away at your content inventory, your responsive content reference wireframes, your linear design, and your breakpoint graphs and you’ve designed for various breakpoints. You’ve visualized your design, the result of all these efforts, in the form of a web-based mockup.
Now you have to present your design to the client.
That is, you might. If you’re not the one presenting the design to the client, someone else in your organization will. And you’ll have to present it to him. I’ll be frank: if you’re the designer, unless you’re the presentational equivalent of a wet towel, I’d recommend that