I love this picture, but I have a small critique. Aquarius, despite being The Water Bearer, is an Air sign. (Specifically, it's Fixed Air.)
The symbol of Water Bearer has more to do with the humanitarian/community-centered nature of the sign. When I look at this picture, I see fish, water, bubbles.... All of this screams 'water'. So for me, it doesn't capture the innate nature of Aquarius as well as I'd like it to.
Again, it's a breathtaking picture, and I love it a lot, but I see Pisces when I look at it. Maybe I'm a little biased because I AM an Aquarius, but this happens a lot with my sign, and it never stops making me sigh wistfully.
I hope you don't take this the wrong way. I do adore your art beyond words.