Imagery is the global language, where understanding becomes universal, breaking down the barriers of communication. You could simply use words to try and describe emotions, actions, circumstances and decision-making outcomes, but Jeff Edis from Glorious Creative in the UK, explains quite simply why you shouldn't -
"Why it’s easier to show a circle than to describe it.
...compare describing a graphic symbol with simply showing it. Take a circle for example. An accurate description would go something like this; a circle is a simple closed curve which divides the plane into two regions: an interior and an exterior. Science adequately explains why the visual expression beats the wordy explanation hands down. 50% of the human brain is dedicated to visual functions. The brain processes visual material all at once, but processes text in a linear fashion. Visuals are processed 60,000 times faster than text. Words are processed by our short-term memory where we can only retain about 7 bits of information, images go directly into our long term memory where they are indelibly etched."
Sure, there are millions of stock images available online for free or for a small cost, but however professional they may be, they often come across as impersonal, disingenuous, and unrealistic. If you want your audience to connect with your vision, your staff and stakeholders, your products and services, then make it your own and invest in some influential imagery.