"illustrate to" is correct and usable in written English.
You can use it to describe an action or provide clarification to something someone else has said. For example, "The professor illustrated to the students how to solve the equation."
Her daughters are both artists – one a painter, the other a children's illustrator, for whom Tyler wrote a children's book for her to illustrate, "to get her started".
"The disclosures just illustrate to me that they have bulletproofed themselves from lawsuits," Mr. Partnoy said.
Former AVID students are recruited for the jobs, because they illustrate to young people like Paul that college is attainable.
To illustrate to what extent pollution has increased or decreased, the NASA researchers measured concentrations between 2005 and 2014.
Finally, a numerical example is given to illustrate to show the effectiveness of the proposed approach.
But, as if to illustrate to the rookie how quickly things can change in the Ryder Cup cauldron, the match almost turned round within two holes.
Mr. Humphreys's aim was not just academic: he was trying to illustrate to the public and the police that straight men would not be harassed in these bathrooms.
The aim, the foreign secretary Jeremy Hunt said, was to illustrate to Putin that the price for this activity is too high.
Paintings then were supposed to be about something, to illustrate, to lecture, to instruct the common people about the glories of God, the doge, or the Medici.
"Apart from making them laugh, I also illustrate to kids when to use humour appropriately, and how it can be easily used in a negative fashion".
The words 'factory' farms and live 'stock' illustrate to just what extent our view of these animals has been reduced to mere objects.
