I'm working on some stuff in different languages and I have designed something in Arno Pro. What would be a good substitute for this font?
Right now I'm working with Al Bayan, which to me looks kinda similar.
If by a substitute you mean a similar "old style" looking font, then Al Bayan could do though it has a rather poor set of ligatures.
But if, shameless, self-promotion is allowed I'd suggest you check my (freely available) [[http://www.amirifont.org|Amiri font]] which have rather a very rich set of contextual forms and covers almost all Unicode 6.0 Arabic block.
And such a pair would work nicely, "on a more subtle level" then just visual equivalent - if I could add my opinion.
Thanks for the advice.