Sorry,
I can't help with the specific photos you asked for, but as a boa constrictor owner I can highly recommend the species.
I have an adult locality boa. He's a male Barranquilla, Colombian.
He's a manageable size and has a wonderful disposition.
Here's a photo of my snake.
He's topped off at 7 feet, give or TAKE a few inches.
If size is your concern, you will be fine with the specific boas you are looking at. In general, boas are of average size and don't usually present handling problems for most keepers.