Having said all that, I think Whittaker’s costume is a little bland for me, but there’s a big difference between promo pictures and seeing it in action - just look at how Capaldi’s costume(s) turned out during his run compared to the reveal promos.
It looked the same as the promos(when he was actually wearing the costume seen in the promos).
That’s what I mean - he very rarely wore the “full” costume as seen in the promos. It’s entirely possible that Whittaker’s Doctor won’t wear the “full” costume all the time, either, and that her alternates might look better than her primary.