Recent Series and Self Critique

I've had some ideas slopping around in my brain since I finished "Piet Goes Green" and sent it off to a show (small bragging here). I wanted to continue working with some grey fabrics I had dyed and painted and some others that I thought it was time to use....
I had heard a suggestion of working with a 12" x 24" size as a good size to sample ideas and design. It seemed to suit me, so off I went....
Here is #1, as two images, one rotated 180 degrees.

What do I think is successful about the design?

• there is good contrast in value
• the partial circles are a good visual break from straight lines
• variety of line widths are interesting

What isn't successful about the design?

•  heavy, dark horizontal lines
• design seems chunky
• there doesn't seem to be any flow across the design

It's interesting to see these less successful parts once there are on the computer screen that I couldn't see on my design wall.
As for orientation, I prefer the one on the right. But once I make some changes, we'll see if that's still the case.

Here it is back again, with a couple small changes.

 It's better, but I'm not sure its right. I've cropped the sides in the next photo closer to what it would be as 12" x 24".

Ok, now the orange chunk in the lower left looks too clunky. I may take that section out and work on it.
Comments? I have a thick skin, so be honest!

Thanks for the comments, I really do appreciate everyones thoughts.
Here it is with the orange fixed up and another orientation that Rayna had suggested. I hadnt considered placing it on the horizontal, it may lead me in an entirely new direction with my design ideas!

 Now I really like that spot that had been replaced.....not sure about the large black and blue piece tho!