Aside from being stretched, (which it seems you have fixed the problem by lowering the light) they look pretty good. The first picture, your plant looks pretty good for one week only under one CFL. Pretty soon your plant will explode and start growing pretty fast. Right now, your plants are just developing their roots.

Once they develope their 5th node, I'd transplant them into at least a 1 gallon pot. Pick up some Shultz Rooting Hormone. This will come in handy for two things:

Transplanting and Cloning. We'll get into cloning some other time, but to transplant, fill up the new bucket with fresh soil and keep filling it up, until you can set your cup down in there, and the top of the cup will be level with the top of the soil. Then, fill in the sides, etc... Now, in the new pot, you will have a perfect shaped "hole" for transplanting.

When it's time to transplant, remove the cup, and you will see the hole in the new pot. Spray the inside of the hole with water (from a spray bottle, etc...) so that it is moist, but not moist enough to destroy the hole. Dust some rooting hormone on the inside of the hole.

Now, here's the part that is kind of tricky... getting your plant out of the cup, without disturbing the roots, and with the soil staying in the shape of the pepsi cup... Water until it drains out of the holes that I assume you poked at the bottom of your pepsi cup. Pack the soil down, around your plants stem, and hold your cup upside down, and hit your hand on the bottom of the cup, and await for it to come out of the cup. It's pretty fragile. You should do this with the least amount of light as well, because roots don't like being exposed to light. Put your plant in the perfectly formed hole in the larger pot, and pack all the soil around it, just so it's in there firmly. Water the whole pot. The rooting hormone that you dusted, will minimize transplant shock, and encourage the roots to grow into the new soil.