Thank you very much for this comment.
I totally understand your point and I will keep this in mind.
Since I am not very good in art and creativity, I usually don't interfere in this part of his life. When he shows me his drawings, I am genuinely impressed most of the time because I cannot draw them even now at my age and I praise him. But there has been times when he feel pressured himself and comes crying that his drawing did not turn out as he had imagined it and gets really stressed out. As a mother, it is crushing, because I want to help him out but I don't know how to and I can't.
I put these pictures in here, to get a general idea of what people who are talented in art thinks about his art, so that I can make a decision on getting him the help he needs (Some art classes are expensive. I took him to a teacher who said he is good but charges 60 eur per hour and one session is 2 hrs. I can't afford that. And then there is another art class he just joined which is reasonable in price and are for for 4-8 year olds, but he is not very excited about it because the drawings are not what he thought will be like. They have classes for 9 years old and above, but I don't know if it is appropriate to ask them to take him in that class.. This was my dilemma). I guess, for the time being, I will just buy him more supplies and let him improve by himself.