Yes the sun is relentless and will get you from unusual angles. Bandannas are important including some fairly large ones, to protect the back and sides of your neck, not just the front.
Hat should have a sizable brim, not just a visor, for ears and neck as well as nose. And a secure chin strap: my favourite hat (navy reversing to navy dots) blew overboard and when we tried a "man overboard" drill, we ran over it and sank it. Now I have the summer weight Tilley, which lets the breeze keep my head cool.
Shades: I wear prescription glasses, so I get the kind that you fit over your regular glasses. I think I would want them anyway, because of the wide side-pieces with the little sunglass window. They maintain peripheral vision while blocking the sun from odd angles, and also protect from wind, which makes my eyes water.
The other bit that needs extra sun protection is knees. Sitting in the cockpit for a few hours can generate quite a burn. I save shorts for wading in the surf; on board it's all capris and crops, and I'm rarely too warm, because it's cooler out on the water. And full length pants are guaranteed to get wet. (I think zip-offs were created for sailors.)
I love your selection of overblouses. From your description they sounded too boho for me, but I would wear every one. Probably because they are all blue and white. One of the perks of the nautical life is the no-brainer nautical colour scheme. My equivalent is a heavy-duty plaid flannel shirt, but my climate is cooler than yours.