Bravo to those learning to use the voice to its potential. Singing in English is a disadvantage because the language has so many consonant stops (s, t, sh, m, ng, etc). It is a more difficult language to get the greatest potential developed in your voice. For that reason, a good teacher of vocal technique will have you learn songs in Italian just for practice, and for technical muscle and placement development. You may never sing them in public, but using the Italian to practice opens the voice up when you use the techniques that a good teacher can show you. Learning something in French can help you develop the 'lift' of the soft palate as well as singing from the 'mask' of the face.
We have had several threads on the topic of singing technique and development.
This one has links to warming up and vocal health, etc.
singing voice

Here is a thread from 1997 about catter's favorite instruments (my favorite is my voice).Favorite Instruments

alice in montana