problem with thumbnail rsolution

a template i made is giving me some problem with the 80X80 resolution for thumbnail
once i reduce it to this resolution the project aspect ration dosent fit. so my choise is nither to really crop the the image,stretch i export it as a letter box. neither is 100% accurate repreasentation of the project?
will it be ok if i will export it as a letter box, or do i need to find another solution?

How much you can convey with Thumbnail? Whole Project?, Never, Just try to convey the Project’s subject, Example : If it is Logo then you can Place Logo formation, If it Titles then in Typo you can show “30 Minimal Titles”, Do not expect customer will understand the whole project by just viewing Thumbnail