I've got a feeling I'm going to kick myself over this one when the answers come in.
News just in. The artist is Angus Mckie, the piece is untitled but has appeared in a number of places, see Mr Primate's comments below - (Many Thanks, Sir) and also, which is probably where I know it from; Paper Tiger's; The flight of Icarus.
And the cover of an issue of White Dwarf.
And on this Sci-Fi anthology
And a version of it appears here, as well, as the DVD cover and previously the video cover, for Def-Con 4. But is this Angus Mckie or just a
rip-off homage. Thank you Ash Kalb for the find.
And the French hard back edition of Dune (thanks Filou)