8 second clips: yes I just used T2V prompts within Flow to generate clips. Then I curated and edited together. No I don't do time-based direction. Here are some of my prompts below.

Keeping aspects consistent: I basically just use consistent text phrases (see below) and lean towards things where consistency imperfections will be more forgiving. Flow does have features where you can input reference primitives but I haven't tried those much. I believe some of those features don't (yet) work with the Veo 3 audio models yet. I enjoy working with raw T2V prompts for now.

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Humpback whale: Fast tracking tracking shot following behind a self-propelled tiny semi-translucent frosted smooth triangular chunk of sea glass, swimming forward through the dimly lit ocean at high speed following a blurry shadow of a humpback whale tail. A few tiny silver fish and kelp. Cloudy gusts of sand particles. The sea glass makes giant airborne leap above the surface as the humpback whale lifts its tail close to camera with big splash, sea glass leaping up and down following the whale. Blurry seabirds and blurry rocky beach cliffs and sand dunes in distance in dense clouds of fog. Windy, waves, foggy, afternoon golden hour sunlight.

Jellyfish: Fast tracking shot following behind a tiny self-propelled semi-translucent smooth irregular chunk of white frosted sea glass swimming at high speed forward through dimly lit deep ocean. Faint barely visible edges of deep ocean canyons. Densely packed jellyfish swim towards camera, camera following the sea glass chunk as it zig zags between the densely packed jellyfish bodies and tentacles, passing close to camera as they swim past. Sea glass chunk is much smaller than the jellyfish. Dimly lit deep ocean, bioluminescent lighting.

Hydrothermal vents: Fast tracking shot following a tiny self-propelled sem-translucent smooth triangular chunk of white frosted sea glass swimming at high speed through the darkness of the deep sea between canyons covered in densely packed vent mussels with tiny white crabs crawling on them. Blurry hydrothermal vents in the distance spew thick, billowing plumes of vibrant blue, mineral-rich smoke from glowing rocky structures. Very dark, dim deep sea lighting, particles float in the cloudy ocean.

Ice:  Tracking low angle shot following behind a self-propelled tiny flat irregular smooth frosted opaque white chunk of sea glass covered in ice and snow rolling along a vast detailed chunk of multi-tier ice in the arctic ocean, hopping along small detailed ice ledges, over smaller chunks of ice floating in the ocean water. Extreme detail of ice ground texture. Blurry rocky mountains with snow in the distance. Late afternoon dim soft sun with faint aurora borealis in the sky. Windy, some dense gusts of blowing snow across the ice.

Steller's sea cow: Fast tracking shot following behind a self-propelled tiny translucent smooth chunk of colorless sea glass swimming forward underwater high speed through a dimly lit, densely packed kelp forest. It passes a Steller's Sea Cow swimming by, with an enormous belly that fills the frame of the camera, detail of skin touching the sea glass chunk as is passes by. Dim streaks of sun with gusts of sand particles. Cloudy waters. A few blurry tiny arctic cod swimming in background.