First lucid dream in a second dream layer + reality check reminder

I've been trying to have a lucid dream for a while and I think I finally did.

Firstly: me and my friend decided that we needed something to remind ourselves to do reality checks, we settled for a henna writing on our hands - here's a picture. It says ''How relative is your reality?'' in latvian.
The first night/morning with it on I stay over at my friend's place and we both go to sleep.

Now onto the dream: proceeded like one of my usual dreams where I'm running somewhere and there's action going on. Then suddenly I'm going through the rooms of some castle, apparently hiding from someone. I wasn't alone, there was an unfamiliar girl with me. We settled in a room and I drew back the curtains slightly to see what's outside - there, in the sky, I saw a red dragon. That's the moment when I got suspicious, you don't see many dragons around, do you (unless you're high most of the time)? I did my usual reality check - pinched my nose and tried to breathe through it. And I could breathe! That's when I realised I'm dreaming. I got excited and closed my eyes, so everything went gray for a moment. I jumped and started floating. Now this is where I am fairly sure that it was a lucid dream, because of the vivid feeling, not just a dream about having a lucid dream. I couldn't open my eyes again and everything started feeling heavy, a bit like the feeling when you forcefully try to pull yourself into an awake state. I finally managed to open my eyes and the heavy feeling lifted off (this is where I assume I woke up from the second dream layer), I was in my friend's room, floating above the bed we were both sleeping in at the time, but there was only one person there - the girl I was with in the castle. Kind of like an OBE feeling, I guess. At the time, for a second it felt like it was my body there before logic kicked in and said ''no, you don't look like that!'' Then I think something woke me up in the real world, either my friend moving or some noise, or the dream could've shifted into a regular one and I no longer remember that part, either way even if the latter, it wasn't for long.

So here I am, left with some questions to myself:

Was it really a lucid dream and was it so unstable because of the layers?
Were they dream layers, even? Although my gut feeling certainly says so since I've experienced them before.

If you were conscious in the dream, then it was a lucid dream. And the layer thing you stated sounds like a false awakening. If you were lucid in one dream and then woke up in, lets say your room, and you found out you were still dreaming, then it was a false awakening. There is no "layers" in lucid dreams like there was in inception. They're all still the same dream. Like I said, if you wake up again in your room and you think you woke up, but really its another dream, then its a false awakening.