I don't mind the darker skin tones, and I like the new Mortimer and Cassandra, but this new Bella isn't Bella. She's supposed to be this semi-unrealistic Jessica Rabbit type character, apart from the skin tone being wrong they'd nailed that look with the old Bella.
I get they wanted to make her look older since she has kids, but realistically Cassandra only looks about 15 so Bella could easily be mid 30s, it would totally fit for her to have a teenage daughter and still look young. No idea what happened to Alexander, seems like they didn't even look for reference pictures before changing him