As time goes by things change here and there and need to be cleaned up to create a uniform appearance across all of your platforms. I came across this interesting Cheat Sheet on website hub that may help with sizing your images. I really need to update my Social Media images and I plan to use this cheat sheet so I thought I would place a link to it and let you use it also. I will get back to you on how it worked. Also as always ask for help if you run into problems. I am going to develop more helpful posts for artist trying to get their artwork in front of the world online. Have great day and let me know if you were able to use it and how things came out.
Social Media Image Sizes Cheat Sheet 2018