Your profile says you are here since 2011. You have over 2000 posts on this forum! Surely you should know how basic things work in Construct.
If you add the same object to multiple layouts, it is shared by these layouts. And obviously the image will be the same.
Lets say you have your character sprite. If you want it to be red on level 1, green on level 2 and yellow on level 3, you have several options:
- Create multiple animations in the sprite - "Red", "Green", "Yellow". Set different animation on start of each level.
- Clone the character sprite, you will have CharacterRed, CharacterGreen, CharacterYellow. Combine them all into a family.
- Change color with an effect like "Tint" or "ReplaceColor".