These vases are one of the nicest pieces you've shown me so far.
They are also quite old. They were almost certainly made at the Bristol Glass Works in England and date to the late 1890s to early 1900s when this ivory-colored decor, sponged with gold around the rims and embellished with botanical subjects painted with great realism and charm.
Bristol Glass were attempting to copy what Royal Worcester were so popular for at the time in porcelain, and Bristol did an excellent job of imitating it. Also, it takes much more skill to enamel glass because the temperature required to fuse the enamel to the surface of the vase is about the same temperature as the glass itself, thus one more degree of heat could spell disaster.
This type of opaque glass is often called opaline, a term coined by the French glass makers of the 19th century, and in France refers to all colors of opaque glass, not just the 'milk' or 'ivory' color.
Yours are very nicely hand painted and, as you mentioned, mirror images of one another, which is not strange at all, it's actually a sign of great quality and known as a "true pair" because they are harder to make than simple superimposable facsimile copies. I believe the flowers are meant to be Japanese anemones, what do you think? Anemones and poppies were enormously popular at the time. Or they could be hellebores?
As for value, true pairs of Victorian Bristol glass are rare and at 11" tall these are a good size, too. However, antique glass has always been the poor relation compared to porcelain and prices are never what they should be considering it takes just the same amount of art, skill and time to produce them in either material.
This pair would eBay in the range of $175 - $250 for the pair.
So they have a full retail/replacement value of $500 for the pair.
Hope this is useful info!
PS. I hope you and Josh are having a wonderfully peaceful time on the tranquil shores of Lake Michegan while we are about to get slammed with Irma. They are talking about 50mph gusts as far north as Atlanta and here in S. Tennessee. Nothing like what the poor dudes of Barcuda got pummelled with, but disrupting nonetheless. Imagine sticking your hand out of a car window at 180 miles an hour and then imagine your whole house going that speed. Puts our own troubles in perspective, eh?