Just a thought--try doing #5 with the colors reversed, like they are in #4. Name in aqua, "photography" in black.
I'm not sure I'm really a fan of the aqua in the logo at all, but I did like the fact that in #4, it's your name that sticks out.
You definitely want it to be as readable as possible. Forgo a bit of artistic flare for readability. I didn't learn this until after I did mine. I watched as customers would bring my logo closer to their face and squint to try and read it at times.