Gorgeous! I'd absolutely leave that pink right where it is - adds another element for motion and looks like it was your plan all along.
On the seams, if pressing them in one direction is working for you - go with it! The bargellos I did, I'd make 2 matching strip sets, and alternate the direction of how I pressed those seams ... and alternate picking a strip from one set then the other - this does give you opposing seams to nestle and match seamlines quite nicely.
I haven't tried it yet, but after doing the One-Block-Wonders with pressing seams open, my next Bargello will also have open seams.