The first thing I was going to tell you after having read the thread was to lose the canister. Man, does it take up real estate!
If I could quibble at anything, it's the planting methods. Eleocharis and Hemianthus really do best when planted in much smaller clumps. Yep, a huge, tedious chore to do, but yielding much better results with regard to growth and spread. This is why I often scape with a glass of wine or a bottle of beer very nearby. Sorry to those who are underage.
Oh and another quibble, Iwagumis really only have a max of 2-3 plant species, especially in small layouts. You have too many.
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I'd lose the stems. Leaves are too big. The anubia is even pushing it. The idea is to create scale and balance. The deception of a larger tank size.
Layout is a matter of personal taste. How many stones (petrified wood) do you have? I personally find that your Fukuishi & Soeishi stones are a bit too on top of your Oyaishi. I'd like to see more of a gap between the Fukuishi and the Oyaishi for you to get a true sense of Iwagumi. Perhaps it is indeed placed that way, but the plant species obscure it.
Sorry if I'm being critical. It's what I do. I will say that it's a nice little start and enjoy your little tank. I often find myself putting together little tanks with spare equipment. That being said, you should look into the Spec V, a much prettier tank, IMO, for this sort of thing. I have a planted Spec 2 and a Marine version, and it's just so much more aesthetic. Here's mine, but it's not an Iwagumi. Just a bunch of plants I threw together with leftover bits of wood.
Regarding stocking, I think embers, while lovely, are a bit too fat-bodied for a tank this size and will throw off scale. Pygmies are a great choice, but they are not bottom-dwellers, unless you are talking C. habrosus. There are three main pygmy corydoras species, C. habrosus, C. hastatus, and C. pygmeaus. C. pygmeaus & hastatus, are more mid-level dwellers and perchers, and don't always behave in the typical "bottom-dwelling" cory fashion. If you want a pygmy that'll behave like a typical cory, get C. habrosus. Another species to consider are boraras species. I've kept boraras and pygmies very successfully in a 2.5g planted tank. There is so much more to consider than inch per gallon when stocking a tank. There is a website that specializes in nano fish that has some excellent selection.
Ok, now I think I've had way too much coffee.
L