Thank you guys Still have a few more shields to do.
Sure : draw the basic shape of the shield in PS, duplicate it to make and inner outline, first one set to normal, second one set to luminosity at 40% opacity. Add a textured layer/adjust color behind them (each shield has a specific textured layer(s) ), add distressed/aged touch all around the shield with one or two layers brushed with several brushes. Then add symbols ( a mix of vectors/PS drawing work) and you're done
@Eilathen : Personal tastes or something bothers you about the mountains? Most of the time, I use to draw a new set for each map I make and I needed a lot of them for this map so I went with more classical ones for it since I want to focus more on some other things on this map ( heraldry,territories borders, labels...) but I'm pretty satisfied of how they turn for now.