Hi Alex, that mixing of senses your were talking about is called "synesthesia". Michele Rushworth and I have it, colors become sounds or physical sensations, music becomes a symphony of color. There are all kinds of variations. My sense of smell drives me nuts sometimes, especially when it comes to body wash! Some smell "crunchy or prickly", some are hard like chopped ice, but some are velvet.
Your painting definitely has all the rich overtones and undertones of a synesthetic experience!
Jean