Quick Draw looks unnecessary to me. Have you considered Master At Arms instead? It provides a similar benefit but with an Expertise boost.
As for Escape Artist, are you going to end up in that position often? If not I wouldn't bother with it, especially since archer rangers can camp at the edge of their range to pewpew people and have AMAZING 'gtfoutta here' utilities. You might not need Durable, either, unless you're planning on diving into melee, and then you'd probably want an AC boost instead. If it's for raising the companion, don't worry, it won't die THAT much.
Then there's powers. Really, the only two things I'd consider is Fox's Cunning instead of the double-shooter at level 1 (because three attacks a turn is great and doing it twice per encounter rocks, though the double shooter works for now), and potentially Flying Steel at level 5, or Spitting Cobra Stance. The rest is all good. Remember, you want to use Twin Strike round after round if possible, and instead pick off-action attacks. Standard-Action shots are only good if they bring more than just a damage modifier, like CC or three hits.
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Sburbopolis, Homestuck RPG: http://www.gamefaqs.com/boards/8-gamefaqs-contests/60981373