I think for a first attempt, you did ok.
1- way too much blackness. The picture looks like a fun picture, in a nice setting, that is ruined by the blackness. It makes me think that the blackness is hiding something wrong. This one might look good in BW or Sepia
2- Probably the best of the lot, but its a bit too far out. Zooming in shows closeness, being zoomed out shows you being far, which is less intimate.
Between 3 and 4, I prefer 3. I like better the look on their faces than in #4, it looks more natural. While blurred, the background is still important. Although the elbows are cut in both of them.
Maybe bring a tripod to your next shoot. Even if its not 100% needed, its often great for making you take the time to think instead of just snapping. Might not want to do this all the time, as it does slow you down a bit, but if you have the time, and if you are having issues with taking the time to think, a tripod might help.
Its ok to take alot of images, just make sure you are taking multiples of the same thing...portrait, landscape, zoomed in, zoomed out...
Get them to talk about whatever, like a natural discussion, even before shooting. "how did you guys meet" or something similar if you don't know them, or something more casual if they are already your friends. When you get them talking and comfortable just sitting, then start snapping pictures.
Or you can start snapping and just tell them that you are just goign to take a bunch of pics simply to test out the lighting in the area and arrange settings. While this is partially true, telling them you are doing that will not make them think that the shoot is on and might make them more comfortable. No need to tell them when you are really starting
