for groups? i think confusion for the most part.
i would say nature - which flowers, landscape, nature,seasons etc falls into.
many are confused because some only want photos, and don't say it in the title, others only want painting and don't say it in the title. i told one person that calling it animals wasn't enough if you want paintings it should say paintings. so instead she put down ART. well photos are art.
anyway, i would say
#1 - nature
#2 - abstract
#3 - animals of some kind
#4 - general art groups - no theme - actually this should replace number nature.
---Mike Savad