this picture is so cute and creative! you did a great job at everything. from the faces to the color to the over all picture, you have made a truly magical picture. it looks like a painting that some pony who know a lot about art painted. also, i can very well see this being part of the cartoon. that's how good it truely is. it has help to brighten my day a lot too. that i want to thank you for. so, no matter what anyone tells you, your an awesome artist and should keep up the awesome work you do!
Regular monitors have a screen ratio of 4:3, which is pretty close to the dimensions of this piece. 4/3 = 1.333333 and 3556/2567 = 1.30. I think it's mostly the right size as long as you don't have a widescreen monitor, heheh.