OK, this looks like a regular slide projector, which explains the greenish cast. You can't white blance for both the key light and the bulb in the projector. You can help that situation by putting a colored gel on the projector, I'd try pink first and move toward shades of purple-ish until I have it right. The reason you had to hold your breath is that the flash freezes the action in a shot, making it happen really fast. You can't use a flash with a regular projector because it would way over power the light from the projector, and you wouldn't be able to see the image. Without the flash, and especially with a dim projector bulb and a very small, weak light source, the shutter had to stay open for a long exposure. That's OK for posed images, hard with a large group, so kudos to you all for making that happen without substantial blur. These shots were a creative try, but the light direction on the subject vs. the light direction on the background are so completely different that it isn't at all convincing. The light on the subject says "dark studio with one small key light" whereas the backdrop says "midday outside with a greenhouse tint that confuses me." The inconsistancy is glaring. From your description, I got the feeling that wasn't the intention. The ladder at the subject's feet seems like it's resting on a studio floor, which would be easily overlooked if the lighting worked. Keep trying, I think if you replace the bulb and casing to make the light much much much more powerful (I don't know if that's possible, you'd probably have to re-wire it, too), gel it, be very aware of light directions, you might have something that works. Good luck!