This is fucking iron; I really love the immature techniques you used.
First thing I noticed was the pillow shading on the shimmering above the back tire; I would just take the shimmer down one color or darken the shade. Its just standing out way too much right now; it looks like a graphic. I would also mess with the levels of your entire pallete, because its very full, especially compared to the reference. I also think you could do a lot better on the windows.
I love the fact that you don't apply anti-alias to some places to create hard edges; I love how you aren't a whore over pixelling techniques and are pixelling as if the world of pixel art is a void. I think I love you!
Haha, no. Beautiful job.
EDIT: Oh, and I love the family, except dad's shirt; I think it would benefit without the dithering.