Aerodrome actual weather - METAR decode - 3 letters for this sky?
This work sheet may be of use and generally the system of Okta is used to denote coverage in a Metar, but I would say 


  L1 Clouds: Cumulus (Cu) with little vertical extent


but it could also be 


  L5 Clouds: Stratocumulus (Sc) not from spreading out of Cumulus (Cu)


But I will agree with Ron on this one, its BKN (5-6 Okta based on the picture in my opinion)