We hade -20 some time,but the temprature is OK now.. Just below 0.. :-) To do skinn tones is blocking in roughly. Try to find value, working back and forth untill it started to look nice.. Then slowly work in details.. I come almost everytime to a point that it looks so bad,that i lose hope. Then i leave it .. Some times you need fresh eyes to see whats wrong.. Then again go back and forth many,many times. :-)