Those are very beautiful CC. So, I take it your inner self is a collision between a peacock and celtic knotting (with a little Kandinsky thrown in there for zest)? I only tease.
It's interesting how that turns out when you paint unconsciously like that. Mine usually end up looking very dark and disturbing and full of eyes when I try to do it, but, as you said, it's very therapeutic.
I think they all look similar because that's you, on the page there. That's what you look like if yourself were abstracted and placed into imagery. The result is a combination of your natural preferences regarding shapes, colour, and line with the shape of your thoughts at the time, I suppose.
I don't know how to reduce the cracking. Is it very humid where you live? That will tend to cause problems with artworks. In which case, the best thing to do is try to find the driest place in your house and store them there, maybe get a dehimidifier if you're really adamant about it.
Edit: I suppose I should stop being a wimp and post something of mine. All right, here we go.
Here's something I did just last week for a storyboarding class. The part that makes me cry is you only see this scene in one panel in the storyboards. Done in non-photoblue pencil.