If you have screw in recessed can fixtures and want to visualize the mini pendants without doing the can tearout first--you can pick up a couple of recessed can/mini pendant light conversion kits--Lowes carries a couple (nickel Model #: MPA-1PNK or antique bronze [Model #: MPA-1JBZ]) with no bulb or shade that screws into the existing edison socket, has a decorative base that covers the recessed can. You can play with different light shades as well. We did this for our remodel, and never bothered to do the formal can tearout. I think there may be other conversion kits at Lowes, but the cover and the shade did not match our kitchen. Hope this helps.

For the uplight, you could go a few routes, especially with respect to dimming functionality. And some fixtures don't support dimming, so you need to figure that out. To that end, I suggest you think through the use cases. For example, the use case that I think I'd appreciate most is late evening, after you've retired to another room of the house, at which time a mellow indirect glow from the skylight cutout would be particularly pleasant. You might also want the more light from this source on occasion, in which case you'd want brighter lights on a dimmer. That being said, here's some options. I'm thinking two, centered on the skylights, mounted near the bottom rim of the cutout (just above the beam probably). Regarding the pendant, I know that selecting pendants is hard enough without more to think about, but one downside of a single pendant vs multiple pendants is thhat single sources create worse shadows. And the clear glass pendants above exacerbate this harsh shadow problem by being point sources, whereas the Fillsta, for example, mitigates this problem because it's effectively a uniform 31" sphere of light. This large diffuser also makes it possible to use a brighter source. For example, you could put a 300W equivalent CFL in the Fillsta, but such a bright light would be unacceptably harsh in a point source like the clear glass pendants above.

Not a pro. You may have to go smaller - 3 pendants could get crowded on an island that’s less than 8 ft long. The trend seems to be to go larger and only use 2, but you can’t go too large with 8 ft ceilings, so it’s a balance. Here’s a guide to spacing

No this is a small space no need to close it in or add more clutter. Also, you have a nice balanced lit room.