Julia H. answered 04/12/20
Every Success Story Starts in My Classroom!
You need to think about the context of the sentence and what you are trying to say.
If your sentence takes place in the present tense, then you want to stick with the sentence, "He stared, smiling at me."
If the sentence took place in the past tense form, then the correct version of the sentence might sound something like, "He stared and smiled at me." In this sentence, I see no need for a comma splice.