The fish is really stunning! Great technique and result.
By coincidence I just came across those same youtube videos. Really helpful as you can see which ones (the opaque ones) to avoid and which would be really nice to have. I was looking around for an alternative to Windsor and Newton, which really frustrate first because I didn't realize at first what a disadvantage not having a dropper was, secondly because you can't buy them individually, and thirdly because half my set has begun to clot and/or solidify for no apparent reason. I managed to work a few back into life, and when they work they are wonderful, but overall I'm left unhappy. I also have some PH Martins ones I've used for years, but I have a set that had both the opaque kind and the transparent ones, and only the latter are much use. Also I don't really trust what it says on the jar in terms of whether or not transparency. The real results you can see in the videos, which is great.