I think full bodies and cute animals would be a good idea!! I'm not much of a stickers or acrylic charms kind of guy myself but that's what I see the most of around on other peoples' accessories if that's helpful
head and shoulders or full body depends on the composition and style, I think highly detailed work probably looks better in portrait style and simplified styles can look good either way
i prefer charms because they're more versatile, but be careful what kind of rings/chains/connectors you use, I've had quite a few budget makes break and get lost
fandom wise, aerith or ffxiv NPCs should do decent! given you getting a big enough audience to sell stuff at least non fandom, cute animals do sound good or cute terrormonsters with many teeth if you sell small enough stickers to stick on planner pages I would definitely get cute terrormonster stickers
oh yeah there is a thriving market in planner page stickers! though I'm thinking of normal stickers, just small, for me in particular, laughs (I just like to decorate the empty space corners of my planner) but I know people design and sell like... weekly/monthly/to-do stickers for specific planner brands and so on
- head and shoulders
- full body
Cute Animals
Text or symbols
other stuff
non fandom, cute animals do sound good
or cute terrormonsters with many teethif you sell small enough stickers to stick on planner pages I would definitely get cute terrormonster stickers
(I just like to decorate the empty space corners of my planner)
but I know people design and sell like... weekly/monthly/to-do stickers for specific planner brands and so on