Casting All Wrong?

Personally, I don't think they nailed any of the characters for the casting. I pictured Aria to be a lot more exotic looking, and Emily to be more innocent, and obviously have red hair. While the actress for Hanna is gorgeous (all the actresses are), I feel like she's still not as ... mature as I imagined? I pictured her to look older and a lot prettier than the other girls, and definitely not blonde haha. Spencer also didn't turn out how I pictured, although I feel like she's the most accurate of the four, just not the right hair colour, again. The girl they picked for Alison is even more accurate than Spencer, but still not as perfect as I thought ...

Also, from watching the trailer, it doesn't look like they changed at all from when they were friends with Alison, to the time after Alison died. I may have misinterpreted it though, but if they don't change at all, that's going to be pretty upsetting, considering that's the whole basis of the novels, and Hanna going from chubby to thin and beautiful is kiiind of important.

What do you think about the casting? Is it going to ruin reading the next book? I'm afraid to watch the show now because I don't want the image I have of all the characters to be tainted by the television interpretations.

Also, how do you think the author must feel about this? I personally would never let any book I wrote be made into a movie or TV series unless I was consulted for every casting call, plot change, and filming location. Some directors do books terrible injustice.