What can I do to improve this sheet?

[Filler]

Not much of a difference, but I shaved off a couple pixels to make the silhouette a tad easier to read. The best way is to see this is to make all the pixels on the sprite a single colour. The version with a couple pixels shaved is on the left, as the original is on the right.



EDIT: I also used the lighter shade of blue for the eyes, as the brothers have bright-blue eyes.