By the way - our guests from Beyond the Mysteriuos Beyond didn't break time and space and appeared in original movie here? Is it Littlefoot with Grandma/Grandpa, not with his mother? 
It's actually just a copied scenery, nothing of my own. But that doesn't have to mean you're wrong.

Also is it just me or is there a bit of shading done on the right side of the left rainbow face? One issue I potentially see with the colouring is that grandpa longneck and the shaded part of the mountain seem to blend together, especially around the neck and head.
I didn't think the shadows in this picture were important. There were only very few, so I preferred not to use them. With the mountains, however, I wanted to keep the shadows so that they would be better visible.
As for grandpa longneck, I have to agree with you. Now, with hindsight, I also realize that it seems to blend.
However, I feel like the rainbowfaces could have had starker colors to make them stand out more from the background. Also, Littlefoot's details are pretty vague but his small focus here justifies that oversight.
I agree with you that the characters need some more color. I tried to make it better in my next picture.
The lack of detail is because Littlefoot and his grandfather are quite small in this picture. I had the same problem with the face of the sharptooth in the picture with Ducky as bait.
And many thanks again for the feedback! I tried to improve the next picture a bit.

The following scenery was invented by myself this time, but I took several screenshots from Land Before Time as help.
Coloring took the longest time. As used to, I traced the contours of the characters with a black pencil.

I was actually a little shocked when I loaded the image onto the computer. It seems to be brighter...
The effect was much worse when I scanned the image than when I photographed it, so here you can see the photographed image.
The picture was very tiring, but I am satisfied with it. That's why I didn't use shading, because I didn't want to disturb the picture.
I would like to participate in the Fanart Prompt "Daily life/Survival", if possible.
I had a few experiences during the last pictures I drew. What always impresses me is that every time I finish a picture, I think to myself: "I won't be able to do that so good again!" Then I start to draw a picture after all, and it becomes successful again. On the one hand I doubt myself every time, on the other hand I am always impressed by myself in the end.