I would not have traded a 3 to 4 feet 2 genes female for a Super Pastel YB hatchling myself but that is a personal call.Was this a fair trade???
Now the issue is that that bottom picture is definitely not a Super Pastel YB, it's a Pastel and not a pretty one at that sorry.
Trades are tough unless you trade with reputable people must than again most reputable breeders won't do trades unless it's really high value animal or quality animal for another reputable breeder, they usually don't do trade with the general public.
Your best shot as suggested is to gather all your evidence (screenshot or your communication, phone number, email address, shipping address etc) and take this to the BOI (http://www.faunaclassifieds.com/foru...splay.php?f=13) if the seller is unresponsive however if you traded with Joe Schmoe, usually Joe Schmoe are here one day gone the so you might be out of luck however you should still try.