
wow, I can hardly keep up with that speed of yours

Let me try to give my very best to write a good and fair critique and give feedback. (I just retired from working on my own art for the moment due to frustration, maybe it helps

)
first some thoughts in general:
It seems to me that you're only drawing the lineart. Do you intend to colour some of these in the future? Coloured art looks 1000% more awesome

Your paper has a bit of an own colour to it. It just looks a bit odd to me since I'm used to white paper but that might just be me

Now let's tackle the individual drawings.
1. I find that his head and neck are drawn very well, however his rump looks slightly distorted. Though don't worry. If I draw Littlefoot without tracing, it'll probably look similar if not... worse

2. I seem to recall that pose of Spike. Don't know which movie it is from but he's probably seeing a Sharptooth right there

Very good lineart, I can't spot anything that looks off

3. When I saw that one, I had to grin because... I've drawn this very scene myself in the past

The lineart seems to be pretty solid here as well, nice work

4. Cera is very hard to draw. I can draw Ducky, Petrie and Littlefoot from memory (well, it won't look good) but Cera is hard to memorize (and there are just so many small things you can butcher so very easily

: ) I'm not sure if her face is 100% correct but it certainly looks good to my eyes

5. Also nice work on Chomper!

Overall, pretty solid drawings so far, I'm excited to see more
