Eh, I wouldn't say the wall is depressing - it reminds me of a sunset and sunsets are pretty happy things. So what if the world is fading into darkness? I like the dark too, me and the few other people in the world. XD
I do like that the horizon is used as a guide for how dark the character gets nearer to her feet and since her face is still in the "sunlight" and her hair frames her face it really stands out. Very nice work on getting the lamp posts to glow like that. If that is indeed a sunset, maybe you could add some light filtering in through the trees just to distinguish their individual branches a little bit. I love the placement of the text, it fits so well there. Nice work - kudos!