Tbh, it might be better if you provided us with the original sources without the background removed @LouThunders

Otherwise, given you've done most of the hard work already, you might as well go the full hog and provide us with a completed cut using the techniques shown in the below couple of videos on how to use remove.bg, one when combined with Photoshop and another using photopea.com, which is a free online app so close to Photoshop that it has the same shortcuts, layout and icons 😉 If you don't have Photoshop, photopea.com is the tool I would recommend to use to tweak the draft cut produced by remove.bg. It's more powerful and versatile than GIMP and other similar tools.

The original actually already has a transparent background.

I've attached it, someone who's far more skilled than I am can give it a go 🙂