This is the 14364th most frequent Russian word.
отмечало
"Отмечало" means "marked" or "noted" (past tense, neutral gender, singular).
In this sentence, "отмечало" is used to indicate the act of celebrating or commemorating an event.
В этом году школа отмечало свое 50-летие.
This year, the school celebrated its 50th anniversary.
Here, "отмечало" refers to the act of marking or indicating something, in this case, colors on a drawing.
Ребенок отмечало на рисунке любимые цвета.
The child marked their favorite colors on the drawing.
In this context, "отмечало" means to note or observe something significant, such as a change in behavior.