macOS Applescript to rename all new images

I have a program that will find the pixel color of an image written in bash, but it only will work with one filename. I have it set so when I take a picture, it automatically uploads to that specific folder via dropbox. I was wondering if it is possible to create an applescript that, when opened, finds pictures in a folder with extensions of .jpg and auto renames that image to img1.jpg

Thanks!

Using your guide, I was able to find a different way to do it by creating an empty folder and used automator to rename the item added to it and move it to the main folder.