From what you've said, I imagine you want to add one of three images, depending on whether the product is "Our Design", "Their Design" or "Designed Together"? If that's the case you can use some Custom CSS to insert the image when the product has been tagged accordingly.
As an example, add the following to Custom CSS:
.tag-our-design .ProductItem-details-excerpt:after {
display: block;
content: "";
height: 70px;
margin-top: 34px;
background: url('https://images.squarespace-cdn.com/content/v1/5ccddebe01232c130192285b/1579074857871-U5MIZU7NR3Z59UDYL28X/ke17ZwdGBToddI8pDm48kJ6-92ZYMJyrVVmd-zdJkg8UqsxRUqqbr1mOJYKfIPR7LoDQ9mXPOjoJoqy81S2I8N_N4V1vUb5AoIIIbLZhVYy7Mythp_T-mtop-vrsUOmeInPi9iDjx9w8K4ZfjXt2dqkcHALc6hkUyAp1LlIHCDsU9ryXIIWQqlJZ-pEUzNdZCjLISwBs8eEdxAxTptZAUg/transparency-our-design.png?format=1000w');
background-size: contain;
background-repeat: no-repeat;
}
Then add a tag called "our-design" to one of the products. The image should then appear just below the product description, like this:
You can repeat this for the other two 'icons', changing the url of the image and the name of the tag.
I hope this helps.
-Paul
