here is the result image of the video you saw (or not)
and here another one...
original size of each one is around about 2100 pixel wide.
i've got really usefull tutorials for this two images thanks to some mate i know from da.
time for the first one about 70-80 minutes the other one i think 35-40 minutes
here a speedy i did in the morning to warm up 10-15 minutes.