I think they're all really pretty! Very "harvest season-y" and autumn-like, it that's what you're going for.
My faves are always very monochromatic - like all yellow, with 1 other color in the very middle - or something like that. Like, you could do all orange-ish with 1 or 2 yellow right in the middle.
I've always thought the more monochrome and the least amount of TYPES of flowers results in really featuring the flower itself and making the whole arrangement more sculptural.