wow thanks for the comments guys! sorry though i cant really post the source, its in class and i dont think my teacher will let me take it home.
the reason i didnt use a ruler for the windows is that i wanted to measure everything with my eyes and my brush to improve.
the wagon wheel does look a bit flat now that i see it but i dont think i want to touch it anymore lol, that would mean repainting the wagon, wheel, grass, and parts of the floor and this took me way too long.
oh also i will post another one in a few weeks so stay tuned.