There's the possibility to use [OpenSearch queries][1]OpenSearch queries on Copernicus scihub API
E.g: https://scihub.copernicus.eu/dhus/search?start=0&rows=100&q=platformname:Sentinel-2%20
But there are no quicklook images for SentinelB̶u̶t̶ ̶t̶h̶e̶r̶e̶ ̶a̶r̶e̶ ̶n̶o̶ ̶q̶u̶i̶c̶k̶l̶o̶o̶k̶ ̶i̶m̶a̶g̶e̶s̶ ̶f̶o̶r̶ ̶S̶e̶n̶t̶i̶n̶e̶l̶-2 like there are for Landsat [1]̶2̶ ̶l̶i̶k̶e̶ ̶t̶h̶e̶r̶e̶ ̶a̶r̶e̶ ̶f̶o̶r̶ ̶L̶a̶n̶d̶s̶a̶t̶
edit: https://scihub.copernicus.eu/dhus/search?start=0&rows=100&q=platformname:Sentinel-2There are quicklooks, see Kerstens comment below