Concept sketching in design is all about using quick, freehand drawings to explore and develop ideas at the very beginning of the design process. It's not about creating polished final products, but rather getting a bunch of ideas down fast and loose.
When concept sketching, it's important to incorporate all of your ideas and opportunities from your SWOT analysis. Maybe you will combine the ideas that you have researched from existing products into one amazing solution...but push yourself to keep thinking of other ideas. Develop 3 - 5 sketches and include the following information depending on your product:
Example using Framer.com for APP development
Check out some wireframing examples...what do they have in common?
Ensuring that your concept sketching and foam core prototypes are set up for scale is important. Watch this clip to understand what can happen if your client doesn't understand scale...