Here's what I know...
The international exclusive SLH ponies are not cheap. Those two Royal Beauties will probably be some of your more valuable loose ponies.
I'm not sure what she'd go for, but I have to say that I love zombie Star Shimmer!
Crowning Glory's haircut will definitely hurt her price, but in good shape, the Black Friday trio tends to go for $20ish apiece.
In your common picture...
-Your Lickity-Split isn't the version that came with Port-O-Bella, since she lacks a hoof heart/magnet. Either way, she's less sought after than Port-O-Bella.
-Precious Gem tends to be more sought after due to her hair texture. The more of that that's left, the more valuable she'll be.
-V-Day Sweetie Belle may be sought after
-I've seen Love Wishes go for $10ish, but she's still pretty common
-Candy Apple may be sought after due to similarities to Fiesta Flair and G4 Apple Bloom
-Tira-Mi-Su may be sought after since she and her sister make a cute pair, and Mochanut is in a unique mold
-Star Catcher I is sought after, but super duper common. It comes down to condition- how crinkled are her wings? Any rubs to her molded designs?
-Candy Cane does NOT belong with the commons!
-Gigglebean is an Easter pony, so she might fetch more
-Sweet Sparkle is probably less valuable than other Cutie Cascades, but I could see her going for more than $5
-Royalette is a store exclusive, which may increase her value
-Twilight Pink was one of my grails when I started out. The only one I've seen listed for less than $20 is the one I bought for $9, which was listed by features, not by name! Those were eBay prices in 2013 or 2014, so take them with a grain of salt, but she's still super duper pretty and her price reflects that!
-Lily Lightly tends to go for a bit more due to her features, but she's still pretty common. I could se $10-15 if she works and has no dress stains.
Maybe more of the common group could exceed $5 (perhaps the Breezies because Breezies), but those are just the ones I think will.
Hopefully someone with more experience will clear this up!