These are superb! I love the fact that they're wearing their livery of (past) life, rather than some "undead costume heraldry".
On the flowers: I'm generally a fan of really plain bases (a deeply unfashionable view, I know, but it was put forward by no less a luminary than Ali Morrison ...). But these work really well, I think. Yes, there is something slightly artificial - or stylised - about the abundant clumps of flowers. But so what? They make each miniature look (ironically!) like a still life - and a still life with a memento mori very much in evidence. It's a brilliant idea and terrifically well executed.