I begin with opening the image in Photoshop

I then opened the castle document I had previously made

Next I resized the castle image and added it to the image

I painted the scenery with white using a low opacity paintbrush tool.

Next I painted the sky using a gray paintbrush on a low opacity

I re opened the castle document as I felt I wanted to add to the castle within the image

I added the tower layer to the image and resized it. I then set the layer behind the castle.

I then duplicated the tower layers for texture and added a second tower.

Next I added bricks to the top of the tower

I then moved the two towers and added a new wall in using the duplicate option and duplicating one of the new towers I had built.

I then added snow to the top of the towers using a white paintbrush

I then added shadows to the new towers to give them a 3D effect

Using a dotted paintbrush tool I added in a snow like effect to the sky, making it look like it was snowing.