I Need a Little Paint Mixing Advice

So here's the deal. I'm working on a Nemesis Prime repaint but I'm have trouble mixing a teal paint similar to the colors on the Aleternators version.
I mainly use GamesWorkshop acrylics and can't seem to get the shade right. Any help would be appreciated, and thanks in advance.
I've done Nemesis repaints in the past but I just used silver instead of teal. This time I feel like going for a little more authentic look.
I mainly use GamesWorkshop acrylics and can't seem to get the shade right. Any help would be appreciated, and thanks in advance.
I've done Nemesis repaints in the past but I just used silver instead of teal. This time I feel like going for a little more authentic look.