How to force Finder to update file thumbnails?

Recently I updated album covers in most of my mp3s, but their respective thumbnails on Finder did not get updated.

Things I tried:

Removed (rm ~/Library/Preferences/com.apple.finder.plist) without solving the issue at all
"touch"(ed) the files, which refreshed some - not all - the thumbnails

Any ideas on how to force a refresh of my mp3 thumbnail icons in Finder?

See the manifestation of this issue below:

enter image description here

Thumbnails are generated by QuickLook. You can reset its cache by typing qlmanage -r cache.

If this didn't work reset it completly with qlmanage -r.

Option Right Click on Finder in the Dock.

Click Relaunch.

It should refresh the thumbnail icons. For sure this worked for images that I rotated with xnview.

A combination of the previous answers worked on my MacBook Pro (mid 2012) running 10.13.6:

In Terminal:

qlmanage -r cache # qlmanage: call reset on cache

qlmanage -r # qlmanage: resetting quicklookd

Then: [Apple] > force quit > select Finder > relaunch

After a few seconds, this refreshed the .png and .jpg thumbnails on my desktop. I don't have .mp3s there so I can't speak to that.

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