It appears to be alright as long as it is only an image in your mind.

I would like to know if a person is allowed to have a mental image of the prophet (May Allah’s peace and blessings be on him) when remembering him? This is easy to imagine through reading about the physical appearance of the prophet saw e.g. beard, beautiful smile, average height etc? Is it permissible to have this image?

Biography of the Prophet salla Allahu alahi wa sallam | February 1, 2014 5:59 am
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I have seen a Hadith which says that the Prophet(saw) use to smile (Not to laugh) , and I have also seen the Hadith which says that someone saw him sitting crossed legs in the morning after fajr till sunrise. Now, Is it Sunnah not to laugh but smile and to sit crossed legs ?
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Sheikh I want to ask you about a story that I keep finding on the net and in some books and even in the classes that I went here in Kuwait I heard about it. There is this incident about Maria the Christian slave from Egypt that was a gift for our Prophet and the one of the wives of the Prophet Mohammed (salla Allahu alaihi wa sallam). They say that Hafsa caught the Prophet with Maria in her room being close to her. And she became very upset of the fact that he (salla Allahu alaihi wa sallam) was nice to Maria in her room. And that he didn’t respect her privacy and her house. So he promised that he will not touch Maria again with the condition that she will not tell to anyone about this. But she went and told Aisha, meanwhile the Prophet had a revelation through which he was informed that Hafsa went and told his secret and she was surprised how come he found out. And he told her that Allah had informed him about her going and telling his secret. Is this authentic or not?