I personally could get behind removing the appearance sections. After all, we do have image galleries of the characters that including every image in which they are clearly visible for every episode. Their pages alone have a full-body image, and quite a few images in their History sections. That section does feel redundant to me, especially since the characters don't change in appearance, with very rare exceptions. The only appearance change that has actually been permanent is the addition of the Mark of the Guard to each Lion Guard member.

I'd also be for Kion's infobox image being changed. As you pointed out, he has inaccurate colors. Perhaps Beshte(ear notch) and Ono's(inaccurate feather colors) as well.

The vast majority of Wikis that I've been to have an appearances section, not so much for those already on the Wiki, but for those searching via google.

A good example - a few months ago, someone was trying to describe a Disney character to me, but they had no way of getting an image to me so they described him. I searched for keywords in their description, and voila! Disney wiki turned up on google right at the top and I discovered that they there were referring to a character from Special Agent Oso. If that description segment had not been there, I honestly don't think we would have found out who it was. So yes, although they aren't helpful for people already on the wiki, they truly are useful for people searching for a character with no further information besides 'Disney' on a tush tag label.

The character images definitely need to be changed. I got those images back when the Fathead sticker decals were released, which was before TLG had been finalised. I'll have a look around for some more recent clipart.