In https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering under Files > Thumbnail size, a list of seven different user-selectable options is provided. The default size for en.wp is currently 220px (wide). The highest is 300px.
Because of the increased prevalence of devices with very high pixel density, please offer a larger size, perhaps 350px or 360px. For caching purposes, 360px might be best, because sv.wikipedia and it.wikiquote are already offering 360px.
One or two of the smaller, least-used options could be removed at the same time.
'wgThumbLimits' => array( 'default' => array( 120, 150, 180, 200, 220, 250, 300 ), '+itwikiquote' => array( 360 ), 'svwiki' => array( 120, 200, 250, 300, 360 ), ),
Following the Swedish example, perhaps 150 and 180 could be removed.