Ooh that airship boat at 5:06 is actually such a cool/good example! So little changed, and even the overall shape/silhouette is largely the same, but those few small changes really make it feel so much bigger and give it that sense of scale. Wild how that works.
4:50 actually, a lot of modern sail boats have that kind of configuration of split fins, one at the back and one in the middle (usually made of a heavy material such as concrete or steel to balance the Weigth of the main sail).
right now I am going through a learning phase with your free video library on Digital Painting Tutorial on your website. They have been immensely helpful. Evidently I am very, very late in discovering your tutorials, and I was a bit saddened when I realized you made them so long ago... I thought you weren't making videos anymore or something (yes I'm a bit out of the loop on a lot of things) So, I was pleasantly surprised and delighted when I opened RU-vid and found your new video on the front page of my recommended tab. Sorry if it's a bit weird for me for saying all this stuff, anyway, TL;DR I very much appreciate what you're doing, and I'm thankful that you still make these awesome videos
Glad you finally starting posting on RU-vid, I used to watch them in your site but eventually ended up forgetting since I spend most my online time on RU-vid.
I've found that 3D renders of primitives or 3D poses are also great sources of reference. It can sometimes be easier than hunting for the perfect photo reference. On a side note. My late uncle was a wildlife painter. Never used a reference in his life. Of course it helped that he had an eidetic memory. He could paint a detailed animal he'd seen while camping 10 years back.