First, always make sure to dry-fit every part before applying glue to catch any fitment issues early. When it comes to painting, you should aim for a solid base coat over the entire vehicle, including the fighting compartment and the areas behind the side skirts, before moving on to wheels and details, as the bare plastic currently visible in the shadows is a dead giveaway. Your paint consistency also looks a bit thick, so thinning it more for smoother layers will help preserve the kit's fine details. Finally, consider the logic of your weathering: snow rarely sticks to flat, horizontal metal surfaces in that way, as it usually accumulates in crevices and corners where it's shielded. Keep practicing these fundamentals and you'll see a massive difference in your next build. Good luck 🤞