Thanks for sharing these pieces with us, @Patricia-Dishmon! The first three pieces do have some nice dynamics going on here. In the first piece, I really like how you were sensitive to the depth that heavier linework can provide--it does bring the main character forward! Have you thought about maybe putting another animal closer to the same plane as Doggie? Right now he could almost be too separated from the others. If you're aiming for a sense of "crowdedness", putting someone near him could give more of that triggering "this is too much" feeling for an introvert. Right now Doggie is more separated and still on his own in a way, with everyone looking at him. A thought--no pressure at all with any of these notes!!
Way to go on doing a tossing upwards scene. Those more extreme angles are not necessarily for the faint hearted!! So huge kudos with that! Maybe darken the line work around Doggie like you did in the first piece to separate the overlap a bit?
Creative thinking on the third scene!! Like how it has a sense of "overwhelming-ishness". Please do keep us updated on these as you continue working on them. 
With these last two, maybe you could put the camera angle on the floor several feet away from his face? Something where it's like we're looking up as he's coming down. And for the last one, perhaps you could do a camera angle looking up from his back towards the kitty? Or, keep it similar to what you have, maybe just bring a little more 3D to the background? For example, you could put a long hallway near where his head is. Have you seen the compositional "trick" of placing the vanishing point where the highest interest should be? The hallway could create leading lines down towards his head.
Hope these get you started and that others will chime in too! Way to go working on a spread like this, Patricia!! I hope you can keep us posted on your progress!