With Plus version, in the normal checkout mode you can create a “add to quote” button with [gpls-woo-rfq-quote-button product_id=’115′ show_image=’yes’ image_size=’thumbnail’ show_title=’yes’ div_width=’200px’].
The sizes include thumbnail,shop_thumbnail, shop_catalog and shop_single.
The resulting image size depends on your shop settings for these images. The short code does not resize the image.