This cel is together with its original background. It is for sale:
It is from the second episode, "The Wind in the Desert".
This is a 3-cel setup with background. It is for sale:
It is from the original series.
This cel is from the 22nd episode, "Dangerous Journey".
This cel is from the 40th episode, "The Troublemaker".
This cel is from the 10th episode, "Two Hearts and Two Minds".
Here is a model sheet for Kimba's mother: