What if the images are entirely like the text, various scenarios.

[Koen G]

Koen, can you affirm that you master all European languages, even the extinct ones?

No. What I can confirm though, it that I am aware of the language families that existed in 15th century Europe. The statistics we know about Voynichese are so powerful that we can use them to eliminate entire language types. There is no need to know every single dialect. It cannot be a Germanic language written in the plain, nor Romance, nor Slavic, and so on.

What could have happened is that a language was written in an entirely novel way. That the whole writing system was changed, not just the shape of the glyphs. But in that case, we are really in "complex" cipher territory and we can no longer assume simple substitution. 

Bottom line is, if we want Voynichese to be a European language, we also have to take into account that the conversion is likely more complex than one-to-one substitution.