[MLP] Busted

Looks great!
-I actually have a personal preference to messier, sketch lining. It's even, "smooth", with a touch of messy.
-Though you have to be careful when coloring, it's hard to keep in the lines since they aren't perfectly clean. Although very minor, any color outside sticks out.
-Also, on darker coat ponies, emphasize the eyebrows because they're kind of hard to see.
-Coloring is on point and the shading is well done, no qualms here!
-A little more detail could have went into Thunderlane's wings. Such as a inner feather lining. I didn't notice at first, but it eventually caught my eye.
-I personally don't like backgrounds that are... middle of the road where it's not abstract, but not fully detailed. A few trees, build or two, detail in the grass, can go a long way to find that blank space. I'm guilty of this in one of my old pieces, but it doesn't mean I like it!

Overall, I love it, I love the expressions, especially RD's. Her face just looks perfect! Good proportions, smooth lines, etc. Thunderlane's is fine too, but because he was a darker coat, similar to the lining, it's hard to see proper emphasis.