Have a Flower! The stem body is supposed to turn more Root like but I don't know how well it reads...
I was also going to add a leaf to the tail but that looked weird so I gave them leaf wings instead.
I like pretty much any design, though I prefer humanoid ones so try to make something that's easy to stand on two legs?
If that doesn't help then just give them a fun personality, like Nervous Wrecks, Chaotic Nuisances, or Overly serious Stoics.
I Dislike anything difficult to draw over and over like lots of small Accessories or Details and overly complex patterns.