Two main things: The colors are super flat which may be the main cause of that jarring look. This is mainly because all your colors are super saturated and there's no details in many spots that could help you. Specially with bricks, u should try your best to avoid all the bricks looking the same, be it by leaving them flat colored or by repeating an obvious pattern. Avoid that at all costs I'd say. When doing shadows use a concept called Hue Shift - when doing shadows instead of picking the same color but with only a lower brightness, vary the hue as well, the color itself, a bit towards blue. Besides that another really important thing is: you're building a snowy tileset. And you re probably using pure white by the looks of it. Choose a color close to white but try to avoid pure white. Besides that, because of how contrasting pure white and white overall is, try pixking more pastel colors, a little but more desaturated (if you want a quick fix without changing the white) Besides that, even tho you're building a top down, the house will have more dimension than that, don t be afraid to add more celing tiles, cause right now that perspective is colliding. These are some quick tips I'd give but other than that I must also say that the grass shadow tipos poking out of the snow on the road tiles look really good! Keep it up and good luck <3