Shen Dong knew his temper well, and it was normal for Mr. Ma to disagree. Who would believe someone who had never touched graphic design before? If he were in his shoes, he would never believe in such a person. But others didn't know that he too had experienced similar situations. Moreover, having the draft made the graphic design work not that difficult.
However, he couldn't just carelessly suggest changes because no one could perfect something in just one try. It would raise suspicions, which could be troublesome. So, it was better to handle the modifications personally.
Once he had finished editing and sent it over, if he was asked about his thoughts, he would say what he wanted. He couldn't possibly say he got it right in one go. That would be too suspicious, and he didn't want to do it that way. It would only earn him a reputation of arrogance, which didn't really matter.