Thanks for the feedback Martin For the rhumbline I used the same brush I used for the linework and they're at 60% opacity, I guess I'll reduce it to 40 %. Concerning the shading, do you mean shades only or highlights too ? I tried something with the forests in the same style of the mountains shading but it doesn't work. I guess to make it work I'd be obliged to go with a soft round brush at low opacity and build the shades and highlights the old fashioned way which means real digital feeling and I'm not sure that's what I want. What's your opinion on it ?