Black Adder Self DefenceLogo Design Contest

Teach lethal hand to hand combat that the Israeli Defense Force special forces use. We teach Krav Maga Force style krav maga.

Most black, greys, and a hint of lime green (eyes or something, just a accent color).

I attached a few ideas.
Really would like to see a badass looking black adder snake, black snake though with a lighter grey or whitish underbelly like in the attachments. some lime green accents somewhere maybe in the lines/segments/creases down the length of the snake and maybe in the eyes etc.
Words on logo will be "Black Adder Self Defence" maybe black mamba above the logo and self defense smaller and under it. Just an idea, you guys are the pros!
If you make a more simple logo like the photo attachment of the girl in the white shirt or the VIPER image I attached which I currently own license on as its being turned into a sub-brand.
***I have toyed with the idea of a slightly more modern / simple version of a Law Enforcement or Military style emblem as we train them and they would like this*** IMPORTANT