Artwork vignettes cropped as square in the listings

The listing pages (Marketplace, Favorites, Collections .etc...) crops the vignettes as square. 
Most artwork is not a square but a rectangle; It is unfortunate as it makes these pages unaesthetic.
Better solution would be "resize to it" / center in the vignette (I don't know CSS/HTML details).
This would be a great improvement/quick win.
Thanks in advance. 


