Point intercept tells you what fraction of the area is what. It does not tell you how pale the corals are, and it does not tell you what fraction of colonies are affected — one big bleached colony reads as a lot of bleached area and one bleached colony, and those are different facts.
The colony question is the one CoralWatch answers, and you already know how. Chart against tissue, lightest and darkest, growth form, at least twenty colonies, uploaded. What this course adds is where and how:
At your station, run the CoralWatch survey by the permanent-transect method — the same recognizable colonies, every visit — and put the survey's identifier and date in your Site Entry. Nothing else about condition goes in the Entry.
Two reasons. Your station's condition record then grows in the database where it is worth most, next to every other reef's, instead of in a format only your Dossier can read. And your photographs are not asked to answer a question they answer badly: the chart was made to be matched against the colony in the water, at arm's length, under a light — not read off a pixel a meter away through seawater. The charts in your frame are for scale and exposure. They are not a substitute for the survey.
If you saw something in a frame worth noting — breakage, a lesion, a sediment veneer — note it against the frame and the point. Describe it; never name a disease. "White band-like lesion at the colony margin, photographed" is useful and a specialist can act on it. "White band disease" is a claim the photograph cannot support, and once it is in a record it gets read by people who cannot check it against the animal.