A TTL (Through-The-Lens) model refers to a type of camera metering system where the light meter is located behind the lens, allowing for more accurate measurements of the light passing through the lens.

After conducting a search, I found a few individuals with the name Maria Alejandra, but none of them appear to be widely known TTL models. It's possible that Maria Alejandra is a lesser-known or emerging model, or she may not have a significant online presence.