what is the standard size for the images for collection dawn theme

Store Design
1

hey all

am struggling to find the right size image for collections , i want the image to be seen good shape in the thump and inside the collection, what ever size i am trying there is some mistakes and missing edges ?

i want to have good size for both mobile and desktop

2

I didn’t ask for upgrading to premium theme, i asked clear question that is the standard image size for collections?