Nearly all character can be very powerful, even overpowered, if you are into full crafting (Enchanting, Alchemy, Smithing).
Now, for your build:
Archery: Critical shot is "critical plops" because it is weak. It is base on the BASE damage of your weapon, NOT on the display damage. So the difference in damage overall will be only, if it triggers, of about 20pts. I would only go Critical 1/3 because it is mandatory to get to Ranger.
Quick Shot: you are going the Light Armor way in smithing, so your Elven Bow upgraded will do more damage at the end than Deadric or Nightingale bow. But for light bows (elven and glass), you will notice nearly no difference in your Rate of Fire. You would though if you used heavy bows. I would drop Quick shot for that reason.
Block: I would only take Shield Wall 1/5. You will have a better "return on investment" by enchanting +fortify block on your shield. I would go Elemental protection and Deadly Bash instead, for the same amount of perk points.
Light Armor: if you go full crafting, then you don't need that many perks in light armor. With an Elven armor + shield (with the guilded armor) You can reach the cap with Agile Defender 1/5 and Custom Fit. It would be even easier to reach the cap if you get Dragonscale armor. Note that with the guilded armor, Matching set doesn't work. Deft movement will not be necessary. Let say this: light armor perks are not really necessary if you know how to play a sneaky assassin well, you won't get hit that often anyway.
Sneak: Because you are using Illusion spells (Muffle and Invisibility are my guess, because you choose to get Quiet Casting) then the entire left side of the tree is redundant and not useful. Muffle and Invisibility will do the exact same thing as the 5 perks you have spend in the left side. You are just loosing the cool animation of the silent roll.
Restoration: If you intend to go Vampire, I would advise to take the Necromage perk.
Illusion: For 2 more points, I would take Dual Casting and Master of the Mind so I can use spells like Fury/Frenzy and Calm/Pacify effectively.
Alteration: I don't understand why you put 1 pt here. Useless in my point of view. Novice Alteration spells are not that expensive. If you can cast Invisibility or Pacify, you shouldn't have trouble casting Novice Alteration spells. I wold so, if you have enough points, advise to take Magic Resistance perks.
I would take Pickpocket, to get the Extra Pocket perk, if you have enough points. Always nice to be able to carry 100 more.