My initial thoughts from listening to one or two songs by each artist:
Casey Donovan
Her voice has a bit of a theatricalness to it. Hard to really have too much of an opinion from what I've heard. I feel a bit indifferent right now but she could surprise.
Didirri
Went through a few of this guys songs as I was feeling again quite indifferent, which I thought was perhaps a tad unfair as I certainly appreciate Australia thinking outside the box with this NF, and Didirri is a prospect I should be welcoming. His song Jude is pleasant. Unsure if outside of the contest though I'd feel eager to delve into his stuff based on the little I've heard.
IOTA
Ooooooo now this has me interested. Really interested. Their song Blush is very up my alley and got better as it went on. My Enemy is even better! I wasn't expecting an alternative rock band in this selection. The singers vocals are fantastic as well. Giving me Distillers vibes.
For goodness sake, I was listening to the British band, IOTAxdoh I thought they were too good to be true. This iOTA though seems cool too, and much more a likely candidate for Eurovision. And OH MY GOSH he played Frank-N-Furter in the Australian Rocky Horror Picture Show. Ok, bye bye alt rock IOTA. I'll take this guy
Everything better be OTT and fabulous.
Mitch Tambo Australia's Jon Henrik Fjällgren equivalent. TBH I'd accept anything that would mean we're not going back to the Australia we endured prior to 2019. People would probably very much enjoy some corny pop with some didgeridoos, and maybe I would too if it was done right. Perhaps a sizeable IF though.
Montaigne
Listened to
For Your Love and started getting into it pretty much immediately once it decided to get its groove on.
I'm a Fantastic Wreck I liked a lot less, and it actually irritated me. But regardless, she seems a promising artist to bag.
Vanessa Amorosi
Very good voice. Potentially could be killer with the right stuff. Not particularly feeling the material of hers I've listened to though. Feels a tad uninspired. Heavy Lies The Head I don't mind but something in that style would probably suffer the same fate as Switzerland 2018.
I feel like Australia are really listening to fans, and I love that. So far it's a varied bunch of artists they've bagged. Looking forward to finding out who the remaining ones are. Australia have such amazing alternative rock bands, especially of the psychedelic kind, so maybe they'd like to please old me and plonk one into this darling little selection.