I wanted to end the "CP/CN" (Canadian Pacific /Canadien National ) interchange lol on my ( 23" by 11" ) N scale micro layout with a small hill and a tunnel.
I built the microhill using slices of pink extruded styrene glued together with latex caulking.
I covered the hill with a thin coat of hydrocal
My 1st intention was to add some small rock casting, but the hill is so small that they would look out of proportion, then I decided to just paint some rough hydrocal spots to simulate the rocks.
I used Woodland Scenics slate gray wash for simulating rocks
I then painted the hill with some latex tan color and added the ground cover.

This is the result:
rear, bottom front and overall view


Jacques

Your tight Jacques, that is a very small hill lol, but you did a great job on it, i like the weathering on the tunnel portal

Jacques...

You made the right call! The "painted rocks" look perfectly natural and in proportion. Excellent job on everything

Good idea for quick tunnel access when the never going to happen de-rail happens.