Translation of Kanji Scroll Painting

This is my first time posting, so any help would be greatly appreciated. I recently bought a Japanese sumi-e and would love to know what the kanji calligraphy means. All I could understand/guess is "70" (possibly related to the author's age?), "mountains", and "light". Images are attached below, and thanks for helping out.

Seems like a poorly-made copy of this picture.
明 程嘉燧《晴山疏影图》（翁同龢旧藏）
平磯小坐一開顔樹影萧疏石藓斑莫訝濕雲飛不起米家原自有晴山
That's Chinese, anyway.