Spec is fine
Glyphs are fine
Running a comparison against Niley is not that wise. Niley's gear is quite a bit better than yours and Im assuming you do not have a warlock to boost your dps numbers either.
Another thing is you are over the hit cap and some of your gems/enchants are wasted because of it - hit rating for raids as a Draenei shaman is 342 for heroics it is 53. You can see a lot of your itemisation is wasted for heroics so someone that optimises for heroics should post bigger numbers
Last thing your gear and gem choices are not great. In general (warning over simplification here) you should go
hit (to cap) > spell power > haste >> crit >> everything else
(Haste is about twice as good as crit until you reach the soft cap where LvB,CL have a 1s cast time)
Bearing this in mind there are several upgrades available to you from non raid sources.
you should never gem for crit or spell pen in pve (there are some gimicky fights where spell pen is beneficial but not many - a raider may be better to advise you on this as I do not know the Northrend encounters) and you should (in general) ignore blue sockets unless you need it to activate your meta
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