I use CampsitePhotos.com to scope out what a site looks like, but I would never count on a picture on that site to tell me what amperage was available at the site - I use that site often, and I'm not sure how you can tell from a photo anything about the electric hookup - you can see a power post in the pictures - that's about it.
Your best bet is to use the CG's website to find out what hookups are available and what surface the site has - paved, sand, crushed stone, etc.
But your camping and having a good time, and that's what counts most.