Just because your looking at a tumblr.Vclip.pic. That does not mean that's who you'll see when you get there!  Very few things you see are legit. Very few Trans look like their post when you get there.No heels,makeup,hair, even VIPS look ratchet .This is what we pay for.

Somewhat, but not 100%

Eros verification, personal website, Tumblr/ deviant art/ Instagram are necessary from us providers' perspective, we need to build a big online identification so when people run into scammers who stole our photos, they will recolonize us. Tumblr pages can be faked, but you could always reverse image search the tumblr photos on google to see if poster is the real owner. I would say go with providers with plenty of reviews is the only way to be sure. Same reason I start to put logos in the middle of my photos now, too many backpage scammer stole mine when the logos were in the corner.  

As far as "always looking dolled up", that's really up to the individuals. The problem exists across the board, some GG providers I have done doubles with are less prepared than some TS providers. That's why I only recommend the good ones when someone asks for a double TS or TS+GG session, trying someone new is always going to be risk.