Basic question re: combinations ..ver2.14

I am still new here. I am trying to set up a shopping cart for a smaller clothing store. with dress slacks, shirts boots, shoes, etc.

Starting with pants…Now, I want the product photo to reflect the color they select and I can do this in the “options/ combination” box. I set a pic for each color, but as soon as they select a size, it says “no pic available”.

Does this mean I have to set a combination of EVERY color with EVERY size (which is very time consuming). For 10 sizes and 6 colors, this would be 60 combinations for one style of pants! Yikes!

How do most people do this? Please just steer me in a direction. Thank you! Stan