Thank you guys, I didn't expect to have so many replies !
@craftysteve : I use many custom mix and inking so it's difficult to explain, but my technics are very common ! For the colours, long story short, ice was paint with enchanted blue (with a little bit of turquoise) and cloth with calthan brown and graveyard earth for the most part.
@Mike3838 : The old crew was a commission work so I don't have them anymore for comparison. But sure the new one is far more detailed and cool !
@nilus : So yes I do commission work. That perhaps why I have time to exercise my painting skills !
And to be clear : in Europe we don't have miniature painting class at school !