Hello, everyone! I'm back from vacation: tan - check, extra two dozen freckles - check, nasty cold - double check.
Welcome to our new additions
I am so glad to see your contributions. As for the rest of you - WOW! You are improving soooo quickly, it's unbelievable!
Now, for individual critiques 
@ Morlanwen
Your shading is really great - soft, and you do a great job of hinting at the edges, rather than emphasizing them. You are well on your way to drawing realistically. Your construction needs a bit of work, though. Don't worry, it can be very easily fixed
When you are still laying down your lines (before shading), take your drawing, and stand before a mirror. Or, if you have a handheld mirror, hold it up to your drawing. Look at your drawing in the mirror. Is there anything off? Maybe the chin needs to go a little to the right... or the mouth. But this is a very easy way of picking up construction errors 
@ Vor
Lovely colours
Did you use a reference for your drawing? DevArt has a very rich reference library, which is truly a treasure trove for artists of all levels. Most of them are for free, all you have to do is credit the photographer
Make sure to always use references. Settle on a point of reference - let us say the head. And then ask yourself questions: relative to my point of reference, how far is the hand? At what angle does it sit? etc. As for coloured pencils, keep your strokes light, that way you can blend much easier, and with several colours. In very dark areas, take a normal pencil (B2), and shade in lightly. It will make everything pop.
@ Ceru
Yessss!!! Gray scale Cullen looks great! And, the nice thing about PS is that you can use layers to lay down the colours later. So, you see, not really necessary to start out with colours
And your pocket quizzies are adorable 
@ Shantia
Soooo... Any progress on your lovely character? I wanna see moar 