i love the background and use of colour, its pleasing to the eye and communicates the tone well, but im worried the contrast between bg style and main style is too wide; youve gone for lineless in the background, and its really working, but then you have thick black lines in the character. Maybe make the lines a dark brown instead; work in sepia tones in general actually, given your theme.
also, maybe change the head/shoulder ratio; the shoulders are too narrow for that head.