2. That character in the calligraphy is
slanted, so is the calligraphy on the wall.

我理解的是墙上挂着的一幅书法画挂歪了,上面的一个字写歪了。
3. A shallow, greenish light
slanted down through a veil of fog and snow upon a treeless, deathly rigid landscape.

一道浅绿带灰黄的光,透过雾和雪的薄幕,斜射到没有一草一木、非常僵硬的原野上。