You could use an image like this in your POS Software, Staff would appreciate when searching for a stock item an image.
However you need to promote your business. The fact is that the cheapest (it's free), most effective, quickest, and the best way today is online on Social Media.
What about a picture of something interesting in your shop? Look at large companies. If you look at their Facebook pages, you will see much of it in pictures.
Well, they know that they have a few seconds to grab a person's attention. Visually you can captivate someone very quickly. A picture can help that person to visualise the product and/or service offered immediately. If they like what they see, they may read the offer. What they want is an exciting image that will grab your attention.
Social media today is an inherently visual medium.
So, where is this headed? You need to be active on social media to promote your business too! Ideally, what you are doing is something on social media at least a few times a month. If once a week, you are looking at 50 images a year. It does not have to be Earth-shaking images. Few of them we see are. Use a picture of a jigsaw puzzle that has just arrived in your shop, a new dog for sale, a Christmas greeting card, some perfume, a book, etc.
Often you can get professional images from your supplier. If not well, it does it have to be professionally made. With a decent smartphone today, anyone can take a good picture. All you need is some basic photography skills.
A Tip: One advantage that an amateur photographer has is that they can take as many photos as they like whenever they like. Professionals can only come at set times and rarely will go back. Use this advantage and take many pictures, up, down, around, left, right, etc. until you get it right. If none worked, try again, it cost nothing today to take heaps of photos.
Another tip: Check out a few youtubes on taking photographs with smartphones. For example, this guy explains it well.
Knowing how to take a good photo today on a smartphone is a skill worth learning.
Give it a shot, and I would like to see some of your examples.