Thanks all, really appreciate the comments and support!
Theatralic, scale wise the Grenadier stuff is spot on. Wolf is supposed to be a lot taller than the average man and Boris is of course a beast. Here's a scale shot I did for my site:

The pencil line behind is 28mm, in retrospect I should have picked a GW mini standing upright but oh well

I'm really happy with the tattoos. So glad I read something that said paint them before you wash the skin, tattoos are in the skin not on it. So I base coated skin, base coated tattoos, then wash, then highlights on both. Don't get me wrong I know I won't win any awards, but I aim for clean and effective models and I love the unifying feel of the tats on these guys.
I'm currently painting up the next three, will add to this thread when I have more to show.
Cheers,
Si