The top of the chimney vent disappears against the background.

What do you suggest for it to be fixed?

Beautiful art, lovely. Love the color tones...
... But I agree with CMYK in the same point...

I know you did'n ask to me, but the suggestion that at least around the chimney the light is reduced.
You're pro, you'll not be hard to get!

Darken one or the other.

Nice job on the blending and the colors. A small addendum to the remarks of CMYK and Daniela: The light is coming from behind, so the visible part of the chimney top should be shaded.

awww.its adorable....i love to see more of the chimney though...but other than that its a great chop...(i'd probably add some gray smoke coming from out of the chimney so ppl could recocgnize it more)

Nice colors!