All image sizes of GD Supreme Directory

Hello Support, please confirm the following image sizes:

Supreme Directory
Listings, Event or Place Gallery images – 800px x 600px
Featured Images (Event, Places Listing Detail), Location – 1400px x 788px

UsersWP
Avatar – 100px x 100px
Banner – why is standard 1000px, can I change it to 1400px to have maybe not so different image sizes for the users?

I m trying to reduce the nr. of different image sizes for my users, what do you suggest to do, Is a good idea to change them all to 1400px as mentioned to do for the featured images of the Listing Detail: GD >> Design >> Home and enable: Resize image large size and Setting >> Media and set the large size max width to 1400 ?

Do you think is a good idea to have all information about the images in its own docs page?

Thank you, Marius