basically the same way most busts are created: by paying an artist to draw them.
sorry, but most generators are limited to a face due to the workload of creating generator pieces, it is much easier to draw larger pictures without making it generator pieces.
you can basically either search for an artist elsewhere or continue posting on this forum until you get veteran status, which will allow you to see the classifieds forums for paid work.
it is also possible to request such a picture, but that is unlikely to find an artist working for free due to the hours needed for a larger bust - there is a forum for free resource requests, but most of it are sprites or tiles that are faster to do.
you can also try the recruitment forum to find an artist for free for your team, but again that only happens if you have a really special idea for your team as free artists are in extreme demand.