Ramchal definitely had a beard! - הרמח"ל גידל זקן בהחלט!

HH

Many people slander the Ramchal saying that he didn't have a beard. Apparently when he was around the age of Bar Mitzva he had cut his beard (See Igros Ramchal - Letters of Ramchal #39. Also see letter 46 from R' Yosef Irgess who discredits the Ramchal in this vein. ). However when the Ramachal was confronted with this (when he was about 24 years old, by someone who hadn't seen him since he was about 14 years old) he replied (Igros Ramchal #53):

ואשר לא השיבותי על ענין גידול הזקן - הנה פה אל פה, אם ירצה ה', אגיד כי באמת כבר מזמן גדלתיהו, ולכל זמן, עכ"ל.

That which I did not reply regarding the growth of a beard - behold mouth to mouth (personaly), if G-d wills, I will say that in truth for along time already I have grown it, and forever.

Also see letter 101, note 374, where the editor points out that a letter was doctored to read, "trim his beard" when the in truth it read "his mustache".

It is important also to take into consideration that the Ramchal wrote at great length -- probably hundreds of pages (besides for the works that we don't have because they were buried) -- all about the important role of the beard!

Great blessings of Na Nach Nachma Nachman MeUman!