It is very impressive for not having a reference. You ask how to do reflections, all I can say is consider observation as a method. Without a visual reference you're limiting yourself to what you already know.
There are countless ways to do reflections, each depending on surface materials and contours, light, colors, and technique. It's like asking how to paint water or animals. It's too big a category to have anything to work with.
Again, I have to suggest that you find something to look at and look at it, and try to process what you're seeing. Look at paintings that other people have done and observe what they're doing. Look at photographs and see what life presents.
I can see in your painting that you are trying to do reflections already as you would in painting a lake using a generic formula. It works to a certain degree, as I can see what you're trying to do. There's thinking there. But the forms are still vague.
Anyway, overall, there's some stuff in this that's pretty cool. What your imagination lacks in visual specifics, it makes up for in ideas. This is almost like a dream where you flesh out the idea mentally compensating for what's not there. One can't always count on other people being able to do it as they look at your paintings.
If you're going to continue to paint this way, which is fine, and certainly interesting as something to explore, you'll have to start taking into consideration things that make paintings interesting in a somewhat abstract way, almost as non-subjective, and work things like compositions and values and balance and those kind of things that are beyond subject.
And in this way, you may find yourself creating a uniquely personal style, which is something that many artists seek to do. You're already there in a way, and it seems as if you're drawn to a personal methodology by something inside you. I think that's very exciting. And like I say, some artists have to work really hard to hear that voice. And you have it from the beginning. People can teach you how to paint like themselves and in that case you run the risk of losing that particular personal voice.
What you have is something to consider the value of for you. The only thing lost that way would be that people may not be able to guide you. But you can be appreciated and encouraged. And you can always modify your approach at any point that it seems it's not doing what you want it to. Or you may find that it's perfect for you and that developing in that direction is the only thing that feels right. So that's your call and what being an artist is all about.
Let's listen to what others have to say as well. This post is merely one person's opinion.
Go go go!!!!!!
"Not a bit is wasted and the best is yet to come. . ." -- remembered from a dream