Stacy, those are awesome pics!!
I DEFINITELY prefer to use my Nikon D3100. I do admit though, that my iPhone takes pretty decent photos. I also have a Samsung Galaxy S4, and I do not like it for pictures.
iPhone is the way to go if you want to do snake photography on your phone IMO.
Here is an example of a picture I took with my phone.
It's not a bad image. It's also not this..
What can I say.. I guess I'm a perfectionist/ photographer.