Since Medusa had lifeless bright red hair that looked like a bad wig.
The lifeless part is a little odd at this point. We've seen two minutes out of a 480 minute project. Based on comments we've heard, it would be absurd to think it'll be lifeless all the time. It just wasn't shown in the trailer, which is an entirely different thing. They aren't showing everything in a trailer.
As for looking like a bad wig. Well, it
is a wig, so it would make much more sense to just say "the wig looks bad" rather than "it looks like a bad wig." Usually, when people say that, the intent is to do a simile, not to describe something in a grammatically awkward way. It's still not great but, after the EW picture, I'm just happy it's more red since it looked orange there. That alone is a vast improvement.
Not your post, but I do want to comment on Triton. Once again, expectations are lower since the leaked trailer made him look blue. I don't think the budget is the issue with Triton. To me, it's a Marvel anti-fin bias. He's very similar to Yondu in the first Guardians movie in that way. Triton's fin is nowhere near as large. To me, it's not dramatically different, but it's less than ideal. There's also some inconsistency as to whether he has one fin or three in the comics as well. The real test would be if they show the rest of his body. Triton in the comics has scales on his arms and torso. Here, he's wearing a jacket that covers it, but I'd like to see some attention to detail if he were ever shirtless.