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In hip hop, it's sometimes called sampling.

You could call this sampling too - a lot of fine art has been made this way. Max Ernst for example.

Thanks, that's generous :) and well, this has always been a difficult topic. Calling it a tribute will possibly give you a bit of pardon... In this case I thought it all right as they were used for a private roleplaying game (not private anymore, I know) and the artists are long dead together with the copyright.

Yes, there are a great many centuries-old drawings and etches you could use.

BTW this made me think of these two illustrations, a view of the town where my ancestors lived around 1600, and one of the nearby castle:

That first one even goes a little way towards your drawing style.

The first on is an engraving, a method I really like and has actually made a few pieces in (which is very seldom among artists and mostly done in a collaboration between an artists and a specialised craftsman). It is made by cutting the cobberplate with a steel Burin (Like these)

The second one is an ink-wash study - and a very fine one too. Do you own them or just found them on the internet??

I scanned them from old books I got my hands on. The first one looked like an original print on a separate page, the second one like a reproduction, maybe a litho, not sure.

I thought the first one was an etching, but I take your word for its being an engraving 8-).

The techniques are very similar and the actual printing is the same, but engravings tend to be a bit more stiff in the expression as the cutting in a hard surface makes it harder to make quirky lines. So the horisontal lines in the sky is a sign that it is engraving. Engraving tend to be more planned with clever ways of crosshatching while etchings look very much like line-drawings and making them is just like drawing with a very thin line.

Rembrandt preferred the much more organic lines of etchings, while engravings where the preferred media for mass-produced images because the triangular cut were more durable than the square etched ones.