Hi ka.arobelidze,
Thanks for reaching to us and take our apologies for the delay in answering because of the weekend.
Basically, the product images are controlled by WooCommerce, through the option of Dashboard > Appearance > Customize > WooCommerce > Product Images
, and the WoodMart theme doesn’t influence this. The size of the thumbnail you set should be larger than the size of the product thumbnail displayed on the shop page.
Or I kindly suggest that you reach out directly to the author plugin’s support team, who are better equipped to provide you with the guidance you requires.
Regards,