I can help, Will you let me send a collaboration request via my Shopify partner portal. Once I am allowed in I can change the coding in your collection liquid file to change that photo larger.
Hey there @Alkukrapok1,
First, it's a good idea to add a big picture so the user focus won't be on the very low quantity of products on the page.
Second, it's possible by editing your collections.liquid file code. Can you post your collections.liquid file code here?