1. Props- Anything thing that adds to a picture and doesn't distract from the subject is great. I got this old bird cage from an antique store (I think it's called Merchants Square and it's on Arizona Ave.) and spray painted it gold. I put a pillow on the bottom and covered it with a vintage handkerchief from my mother-in-law. The little flag banner my mom helped me make for my baby shower and it's just scrapbook paper and ribbon sewn together.
2. Lighting- is sooooooo important. These pictures were taken around 4pm. 5 would have been a little better. I love getting sun spots and rainbows in my pictures. The way to do that is just point your camera at the sun. In the picture below you can see the sun (top right corner) and a little rainbow (bottom left). To make sure there was enough light in the babies faces I used a reflector to bounce the light (actually Ash did).
3. Have really cute twin babies.
Hope that was a little helpful! I might be forgetting because I'm a little tired so let me know if you have any questions.