in photoshop try putting the images onto one layer, and creating a blank layer on top, then trace around the edges with a size 3 brush (it's a bit big, but in comedy you NEED big edges )
then fill the colours in to get the edges, and then sorta play around with sizes, when i did it the jeans and stuff got a big bigger so i resized the feet. then add a filter to it, i did a Filter/Texture/Grain and set it to 40, 50 and grain type soft. (This adds a bit of style to it which looks nice ). Then it came out like this. the drawings still need a bit of work to get them looking really good, but i see instant improvements