how to acheive thumbs up from experts

A reply to a query gets the thumbs up from an expert only when the expert feels that the solution is correct and descriptive enough, so that there is no doubt about any concept, and the person asking the query is satisfied with the answer. In English, we specially make sure that the answer written is grammatically correct. Moreover, we do not give 'thumbs up' to answers which are copied and pasted from the Internet.