@Eilathen: Thanks!
@Ilanthar: Thank you, too! I used a blend of customized textures designed to fit in where I need them. I never (or better, very rarely) use textures out of the box as they come. The recognizability is just too big, making many maps look the same even though they are different; just because both used the same textures. It's the subtle details. =) As for the lines in the north, I see what you mean. Not sure if I keep it that visible there. I'm in the middle of making this. The land stuff ist just a clipping-mask of a sattellite view of the Lake Titicaca region. It's supposed to show what I aim to do, style-wise. But - of cause - not with existing pics, I'll make this all myself with drawing. =)
Cheers, Steffen