What is the correct size is gig images now?
550*370 is the best size. You can search on Google for the exact gig image size
Fiverr gig photo size should be: Dimensions : 550 Pixels by 370 pixels (minimum) which means width should be 550 pixels and height should be 370 pixels at-least. Image Size : Image size can be up-to 5 MB
You will get information about gig image here