While I think your work is good and shows obvious talent, details need a lot of work. The faces for some reason bother me, the shading - the hash marks on the cheeks? Why? They all look either like they've got a LOT of makeup and it's running, or they've all been blushing/been bruised. More delicate shading if you're going to ink the hatching, is in order there.
In the color works, they're really nice. However you need to work on shading in color, and keeping a single light source direction for shadows.
Otherwise, the proportions are nice (though not Pini elf style, their heads are small like I draw them, I just can't do 5-to-4 head high people and call them normal... :) ) and it looks like you've got a great eye for costumery.
So it's tweaking I think that's most in order.