Do you mean that by drawing on it, the child is making the wall look untidy?
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Vctory OngThanksMy sons like to draw pictures and scribble on the wall/s of my house. (based on the picture you provided earlier)
Is it right to say so?
"My sons draw graffiti on the wall of my house."
"It's illegal to draw graffitti on the public items."
Many thanks in advance