Very atmospheric!
Great finish: "Hello fellow dragon", and from here the new adventure begins with this dragon egg.
One suggestion: beware excessive use of the "was" verbiage. Maybe the English is the translation, and you didn't use so much "was" in the original?
Editors who would purge "was" and rewrite annoy me. I'm a fan of Dickens: It was the best of times; it was the worst of times. Rewriting to replace "was" with a stronger verb? Sorry, no.

It was a dark and stormy night

sorry, no, I wouldn't rewrite that one, either!
Never mind that it's the most famous of all the much-maligned "was" sentences to open a novel.

We can often omit there is, there was, there were, and there will be with minor changes in capitalization and punctuation. Whenever possible, we should choose stronger verbs.

You write:

As she got closer, she saw that at the foot of what was an old Victorian looking mirror was an egg the size of a basketball. It was an emerald-colored egg that had some kind of very pretty embroidery. The egg wobbled from side to side, and a glow of the same emerald color was visible within it.

Editors might trim it down like this:

She stepped closer. At the foot of an old Victorian looking mirror sat an egg the size of a basketball. Emerald-colored, with some kind of very pretty embroidery, the egg wobbled from side to side. The same emerald color glowed within.

Is the revised version any stronger? You get to decide, not an editor!

After a few years of fiction workshoppers red-inking and rewriting my prose, I just quit the workshopping. Yes, we need to cut out excess verbiage, but these fellow authors took it to an extreme.