Yes, we love to see images from startups. rather than long texts. Please be sure to put image to your application. It's okay to designing with powerpoint. Image can offer us much more idea and understanding to your plan.
Yes, we prefer images of Product / Prototype. Also we like diagram for your business model or value proposition.
You may put your team group photo, because it will help us to identify. Or data. Data might support your background of technology. But make sure to arrange it for understandable form without reading full-thesis.