@prezial:
Kelly: He probably wouldn't dislike those, but his usual style is simpler, with more of a southern/country lean. this, this (found on a google search that linked to a reddit post; pic is not mine), and this are decent examples. Personality-wise, he's usually pretty quiet and laid back, but has a goofy sense of humor and a bit of a dramatic flair. Always seems preoccupied and tends to wax poetic about things he's really passionate about. Also he's not super tall, but kinda lanky looking. Long fingers, prominent joints, thin but not delicate.

Axel: Being a rambunctious kid, Axel doesn't care much about clothes; slap him in some random t-shirt and shorts and he's good to go. Favors loose-fitting comfy things he can get dirty in, cartoon characters, and the color orange. Probably also has some kid-sized metal band shirts. Hates brown, is not afraid to wear sparkly things for dance class.

Vilke: She's tall, kinda lean and toned, not super curvy and a little broad in the shoulder. Usually wears loose, flowy skirts, sarongs, etc with headscarfs and plenty of assorted jewelry. Hates wearing shirts and shoes but will put on some sandals and whatever top she happens to find (even if it's just a folded-up headscarf) when she must. Occasionally wears body glitter, frequently wears heavy eye makeup and doesn't bother washing it off every day. She has a few tattoos. The important one is the sunset just below her chest; you can probably play around with the arm ones. Unfortunately this old unfinished WIP is the most up-to-date full body pic we have of her: slight NSFW warning for artistic nudity (if you need me to censor out her boobs and upload a different version, let me know and I can do that real quick). Her ears should be curly on the ends and her pupils are slitted like a cat's (since it doesn't really show in this pic).

@prezial: sweet, I look forward to seeing what you come up with!