'First' and 'Second Pass' (next video) are really what we carvers call 'bosting' or 'bosting in': sketching in, placing, the main forms and establishing their relationships. That's it. Just work out what's going on at this stage; refinements, modelling, details - they all follow on.
This is quite a long video. Around 26:40 I make a design decision about a part of the upper tail You'll see me re-carve this part in the next video. It happens!