It's actually super easy to make your own tokens using free software such as TokenTool. <a href="https://www.rptools.net/toolbox/token-tool/" rel="nofollow">https://www.rptools.net/toolbox/token-tool/</a> Do a quick Google image search for "the Expanse ships", save image, set portrait image in the software, scale appropriately, choose a token border (lots of styles to choose from!), and export. Quick n' dirty, but can make some pretty nice looking tokens with basically no artistic skill required. Obviously you can get into image processing s/w like GIMP (also free!) to make tweaks, effects, or isolate subjects with transparent or otherwise customized backgrounds, etc., but I'd just start with the simplest solution and see how far it takes you.