Cool piece! The colors are stellar. I love the reflection as others have mentioned, but I actually really like how you did the posts, I think the single pixel step-over gives them a lot of character, and I got the impression that they were slightly tilted or bent immediately rather than thinking they look strange because of it. One thing that I think could be improved is the grass. As it is, I find the pixel-wide blades a bit noisy and distracting, and the close proximity of the different shades of green further the effect. I would try and have larger areas of solid color with only occasional spots of the different shades to suggest the grass.
The reflection is really nice, and I like the red of the house!
That's a really helpful advice actually. Thank you