I don't know if you can read Spanish or not, but here's a blog out there called 40K Tenerife.  I've no idea what those guys are sayin' but the posts are mostly eye candy and some crackin' ideas and compilations.

Anyway, they've put up this:

Free hand nose art

Now, I think that there are probably enough 1/48 and 1/35 transfer sheets about to get away with doing what these people are doing freehand.  But that's just me, not having confidence in my freehand.  I'll always take my hat off to someone who gives it a go.

What ?  You still here ? Go take a look.

WIP air frames without nose art, c 2014.  Hummm.