Well done Lisa. And what a jungle that is going to be in a few months
You already got the answer on the "flower", and I agree; grown emersed as many nurseries do with bog plants like swords, they will readily flower. But grown submersed, they never flower (or very rarely in a plaudarium situation perhaps) but plantlets will form on the inflorescence (flower stalk).
Agree on more wood, that tank has the length to make it worth while, not to mention the 8 Botia histrionica will appreciate lots of nooks and crannies to play around. Be careful not to space it evenly, always have different distances between wood, it will appear more natural. A sunken log in between the wood and stump on the left, lying on the substrate; 2-3 more "standing" pieces between the stump and cave [see below for suggestion on the cave] with another lying on the substrate, would be along the lines of those focal points I mentioned in our PM.
The cave I like, it is just in the wrong place. Being rock is needs to come from somewhere as it would in nature. A background with a subdued scene of something rock would work, I have managed to continue my background with identical gravel and wood, although with all my plants this is obscured anyway
. Another method is to put the cave directly in a rear corner with no plants behind it; it is the plants behind it that gives it the appearance of being "out of place" as it is just stuck there in space as it were. Moving it back into the right rear corner for example, then planting swords around it (but not directly in front to leave the opening visible and accessible) will look much more "natural". Try it and see what you think.
I like very much the way you've landscaped the substrate with rolling unevenness. I've tried similar but the substrate seems to settle out even in the end, usually after just a couple months. Apparently you can place something under it to keep it uneven, I believe egg crate? Maybe you did that. Anyway, let us know if it remains or evens out over time.
A great aquascape, and one that will get even better as it matures with nature. Well done.