So the part in red looks off compared to everything to hight of the cliffs. I was thinking about extending the part in blue but i want to make the ramp seem steeper, so widening it wouldnt help in that aspect. Any ideas?

Here's a pretty nice show of how to create transition terrain that looks like a hill:


Of course, yours is on dirt, so that makes things a little difficult..

Right now, it just looks like a bigass natural wall.
So i would suggest finding darker shades of dirt, and then just make it look steeper from there. But like Falkoner said, yours is on dirt. So it is very difficult.
So in order to fix that, copy and paste your big cliff and paste is somewhere else on the map. Then, just start over again with high dirt. Once your done, copy and paste the big cliff you pasted somewhere else on the map and paste it where it was in the original picture. Then, just removed the dirt splotches you had copied with the rectangular tool. Then, just use the ramp tileset to add a slope.

If you want to stick with dirt though, your going to have some trouble.

Try using mud (or jungle) and the backs of the rock doodads to make it look less of a wall and more of a ramp.