Common Adder (Vipera berus):
European Asp (Vipera aspis):
Here's a Snake plate painted in 2004. I remember this work drove me mad, so I was a bit scared by the 3 snakes in teh list of the poisonous animals. But to my great surprise, they haven't caused me much trouble.
Natrix natrix, Coluber viridiflavus, Elaphe scalaris, Elaphe longissima: