Using paynes grey and a drop of burnt sienna, turn your paper sideways and from the top, add the mix, then dilute as you go down the paper, then back to full strength again, so you have dark/light/dark.
Turn your paper back to horizontal and leave to dry.
Draw lightly the house shape and a suggestion of trees.
Then below the house, splosh on loosly some of the grey and sienna, leaving an area clear near the house.
Then carefully with a chisel edge brush, cut around the house top edge with a rich dark mix of both colours to create the house, then adjust the edges of the tree shapes until it looks right. Drop in and lift of a little of the two colours as you do this. Take your time, as this is the focal point of the composition.
Then when that's dry, if you're feeling brave, you could add some house details (doors, windows etc, but not too much) and quickly spray a little water and hey presto, crumbling stone appears! You may need to blot with tissue if it's a bit strong. Pracitise this bit on spare paper to be confident.
Add a little more dark around the house and horizon if you wish, leave to dry, add a mount to frame your masterpiece, stand back and admire!