Caspar David Friedrich.

Caspar David Friedrich was a 19th century gothic/romantic painter, who's most famous image is one you have probably seen before:

"The Wanderer" 

I like Friedrich's subject matter - how he takes these breathtaking landscapes and puts people in them - most of the time the people are so small almost to the point of insignificance: 

His use of scale in addition to the colours and the way they seem to blend into each other create really emotive, almost lonely images. I love how the sky always features a dramatic colour and how the light is present, but not overbearing.