Intensive meaning (very x) is expressed with widened eyes and raised eyebrows. When these non-manuals co-occur with adjectives, they function as intensifiers. Also, the mouthings of those adjectives are exaggerated. The first example below is cold. The second one has the intensified meaning 'very cold'.
cold
very_cold
The following examples are the adjective hot (spicy) and the intensified adjective very_hot (very spicy):
hot (spicy)
very_hot (Very spicy)