Nice ones!

I think some characters still need some improving but they're already great as they are drawn. I probably couldn't have done better
First pic: First the background: Did you create it yourself? Second the characters: I noticed a few things that might could've been done better (again: They already are good! This is just meant to be constructive

). Littlefoot, Cera & Ducky have thick, black line art whereas Petrie & Spike have thin line art. I wonder if you drew them like that purposely. I personally would always stick to one 'style'. I also suggest you to colour them brighter, this is especially problematic in case of Cera since that what is supposed to be orange rather looks like brown to me since it's only lightly coloured. Ducky, Spike & Petrie are coloured more brightly (though Petrie's wing's and stomach's colouring (apparently, you used just a pencil) doesn't look so great but that's just me. I personally use very light blue for that.
As for the characters themselves, Petrie looks good, just somewhat weird but in a positive and funny way

, you succeeded on Cera undoubtly

, Ducky needs some improving though but that might be due to her little size, Spike is my personal favourite in this picture and Littlefoot looks fine as well.
The dalek looks alright to me (I never watched Dr. Who).
Second pic: As for the colouring, Cera & Littlefoot are coloured too lightly here, Spike is a little less bright compared to pic 1 but still okay and Petrie & Ducky look good in terms of colouring. Here you used the same line art style for all of them

As for the characters themselves, Cera looks a little bit too fat though that might be due to the perspective

but she looks good, Littlefoot looks fairly good, I like his expression (he's like :blink: ), Ducky looks better than in pic 1 even though she's apparantly even smaller than in pic 1, Petrie's wings look somewhat 'Helloween-like', I like it

, and Spike's well done again. The dalek looks slighly better than in pic one though that might be since he's alive now...
Only one more question: Did you use a reference for the Gang?
I think you are a talented artist, you just need more experience

If you keep doing more fanart, you'll improve with every picture

Just colour your characters brighter (--> use more colour) plus the thick line art works better than the thin one

Keep drawing!
