Cosmetic update ideas
(adding onto what others have mentioned)
-Multiple floral hairstyles to choose from that change with the seasons to represent plantsims being one with nature. Spring: bright pastel color, summer: deeper/darker color, fall: red/orange color and winter: dark brown color (dormant). (Also having the option to opt out and customize hairstyles in any color in CAS for those who don't have seasons or don't want the feature)
-Plantsims having a trail wherever they walk to like in the Sims 3. Different options could be a flowery trail, green leafy trail and a brown roots trail. (Also have a toggle off option for those who don't want the feature)
-Full body tattoos: they can resemble flowers, leaves or roots. Also a neat feature would be the tattoos changing colors with the seasons along with their floral hair.
-Having floral accessories like necklaces, bracelets, earrings, etc. would be neat. Might be too much work to get a full plantsim wardrobe but being able to accessorize plantsims with small plants here and there could make up for it.
-plantsim tombstone- I couldn't find if plantsims already have a custom tombstone but other occults do so yeah having a custom gravestone would be a neat addition.