Further to what Carol said below, my viewpoint as an editor is that a good article is not going to be made or broken based upon the choice of image and there are innumerable suitable images available for free on Unsplash and similar sites. A very common mistake we see is thinking that because an image is on FB or IG or a website that one is free to use it for their own purposes. NOOOOO ONE IS NOT!!! Please do spend a few minutes reading our image policy docs that we linked in the body of the story. This will save you and us much time later.

If you use Unsplash, the necessary caption is automatically inserted into your story. If you are new to Medium, this beginners guide I created may be very helpful. https://medium.com/illumination/beginners-guide-to-medium-basics-c848727eada4