Edit: Ahhh, I had a huuuuuge post written out here that I deleted by accident. I'll try to summarize and be brief.
The gist of it was how would you improve on Elaine being more likeable? To me, she:
1. obviously needs to snap less at Guybrush and consequently us, the players;
2. she needs to sound more like a sweetheart or a loving wife than my best friend's mum.
I think a total re-do of the character model would help, as she looked so...charming and pretty in the first and third games, whereas now she's more like a middle-aged woman - she seems 20 years older than Guybrush. And very, uh, British, as she says phrases like "Buckets" when Guybrush asks if she's missed him. Which is fine, but phrases like "Buckets" make her sound more like she's from Keeping Up Appearances than Monkey Island.
Elaine works best when she has the upper hand on everything - the better the comeback she has against Threepwood's enemies, the cooler she is. Obviously, after Trial and Execution, her character has developed enough that she doesn't trust herself that much anymore. Which I think means she'll be more open, which means she'll hopefully be more likeable...
I'm not suggesting that her being older is unappealing by default. I'm just saying that Elaine works best when she's more of a sweetheart and less of an angry mum. And her character model, unfortunately, reflects more of the latter than the former.
Just to elaborate, to me, this is the appealing Elaine:
Exotic and mysterious, in a way, and Alexandra Boyd's voice, which was softer and smoother in CMI than Tales, added to it. It's much harder to do that with this Elaine, who also looks like she has extra bones in her cheeks:
I hope it's not an unreasonable request to re-do her character model and make her more likeable. I love Elaine, when she's working; Guybrush loves Elaine by default. It'd be a shame to see her become a fifth wheel.
Edit: I don't mean she should be pretty and smart, aka some sort of man's woman. I'm not like that. I'm just saying that I enjoy my girlfriend's company when she's being nice. I take the good with the bad, but it wears on me if it's 80% bad and 20% good.