Nice relief work QED42 but I have a couple of comments: 1. The lack of context, labels, points of reference. 2. The border is too black and white if you know what I mean - perhaps you could soften by using some lighter and darker shades of grey. 3. Again the border, it's irregular - check out arsheesh's tutorial.
Nevertheless you've got some good things going on with the topography so I'll rep you for that