The first pair (the Highlander Kilt Shoe or Glenfinnan) tends to appeal to those with more modern tastes, while the second is by far the more traditional.

In Scottish Tartans and Highland Dress, one can find examples of both kinds of shoes (though the closed shoe has a rounder toe). That could just be the illustrator taking liberties, though.

The two evening shoes endorsed by MacKinnon in the above book are the buckle-and-strap shoe and the ghillie brogue, though he recommends the ghillie with red laces and with a silver buckle. I might consider evening ghillie brogues in this style, though I much prefer the buckle-and-strap shoe.

There is no problem with patterned buckles, in fact, I much prefer them to the simple buckles supplied with most shoes; though they're often quite expensive. I'm very fond of those offered by MacKenzie Frain.