did you trace over everything in photoshop?... 'cause it would be a lot easier to just darken the contrast and BOOM- you got your lineart nice and black. ^^ then go in with colors...

The shading needs work, too. One dark line on everybody's shirt...? No. Sorry, but no. There is always more than one wrinkle, unless the shirts are made of cardboard (which it looks like they are...). Pick one definite light source to begin with, then add shading away from that light source. Also, try to make it more than just a dark line. Try blending it in with the rest of the [insert body part here]- going from darkest point and lightening outwards. I can show you what I mean in school tomorrow.

There also need to be highlights on everything- not necessarily shiny and sparkly like their hair, but just portions of their skin and clothes where the light hits the brightest- for example: if you want a white shirt, pick a base color slightly darker than white, then go in with the dodge/burn to lighten it up in some areas and then do the shading. Again, if you're confused, talk to me at school.

--
What's hell without a little fire? [insert flamethrower]
... I'm pretty sure fire extinguishers can't heal second degree burns...
'Almost' only counts with grenades and horseshoes.

heyy!!! ok, i love this pic^^ mostly because i drew it~~ lol
i think you can guess now who i am.
i made a new account so~~