The Prophet salla Allahu alaihi wa sallam used to both smile and laugh. As for sitting crossed leg, I do not know such a hadeeth.

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 ?

Biography of the Prophet salla Allahu alahi wa sallam | February 1, 2014 5:58 am
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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?