Her model's made by some guy called Petruz and this screenshot's taken from Valve's Garry's Mod.

This snake lady looks like she's in a flirty mood and came to slither to ask you guys "So, I hope you don't mind if I give you many snakey kisses, hmm? And, maybe some cuddles from my scaly tail, darlings?" Better be careful, her tail's muscle is very tough. Which means, once she coiled you guys with it, there's no point of escaping until she's finished with flirting with you.