Being inspired by someone is a compliment. Copying their whole thing and posting it as yours is theft.

Learning from someone means taking a method and running it through your own hands. Taking their work whole and letting people believe it is yours is a different act, and the difference is not subtle, since one adds something to the world and the other removes credit from a person who earned it. Influence is how every art form has ever moved. Hiding where you got it is what makes people suspicious.

When something of yours clearly comes from someone, say so in the caption. Then change one real thing, not the colour, so a decision of yours is in there.