You are not building a model from nothing — that takes a data centre. You are taking one that already knows what pictures and motion look like and nudging its weights towards a narrower target using a comparatively tiny set of examples.
The dataset decides everything. A few dozen varied, well-labelled examples beat hundreds of near-identical ones, because the model learns whatever is consistent across them — and if every photo was shot in the same room, the room is part of what it learns. Variety in angle, light and context is what separates a subject from a memorised snapshot.
Overfitting is the standard failure and it looks deceptively like success. The model reproduces your examples beautifully and has lost the flexibility to place your subject anywhere new, which is exactly the capability you wanted.
In practice
- Vary the examples deliberately: angles, distances, lighting, backgrounds.
- Label consistently — inconsistent captions teach inconsistent behaviour.
- Adapter methods like LoRA are the light-touch version of the same idea and are usually enough.
The mistake to avoid
Fine-tuning for something a reference image would have handled. Training is a commitment; references are a per-job decision you can change tomorrow.
Related terms
LoRA
A LoRA is a small add-on file that adjusts a large model's behaviour — teaching it a specific character, product or style — without retraining or replacing the model itself.
Character consistency
Character consistency is whether the same person, mascot or product still looks like itself across separate generations.
Distillation
Distillation trains a smaller or faster model to imitate a larger one's outputs, which is where the fast and turbo variants of familiar models come from.
Multimodal model
A multimodal model handles more than one kind of data — text, images, audio, video — inside a single system rather than bolting separate tools together.
Diffusion model
A diffusion model generates by starting from random noise and removing a little of it at a time until a picture or clip is left behind.
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