Abstracts are very interpretive for the viewer, and its hard to critique only in that we (or I) don't know if what you ended up with, was truly what you were after when you began. Is the painting, what you hoped it would be, once you finished?
I personnally, am not a huge abstract fan, but I really like the colors and the texture definitely in this and even moreso that this is saying you are thinking out of the box, but using a surface that is more-or-less unconventional. This is good experimentations. Keep doing it.
As for composition... I am not a fan of them, side by side. That being said, I do think their compositions (each painting on thier own) can be quite intriguing.
Definitely keep doing experimenting!! Nice job!
May your world be painted in the
Brightest of colors!
**Artist / Illustrator**