Reccomendation letter - first attempt

Dear Mr/Mss,

When I read in the newspaper your job advertisement for a photographer, a name came immediately to my mind: Raffaele (metterei anche il cognome). 

He is one of my best friends and I have known him for three years now. He attended a prestigeous art high school in Italy, and his professional experience so far has given him a really good expertise in visual arts as well as in sculpture and graphic arts.
He is a kind guy, always cheerful and mindful of the problems of the people around him. One of his main traits is his sensitivity. It is really hard for me to understand how he manages to understand my mood from small, imperceptible clues. I think  this is a key requirement for a good photographer, given the importance of catching the right moment in order to take good shoots. 

All the people who know Raffaele describe him like a "genius", an "artist", or a "great photographer".  Just a glimpse of his works can give you the perception of his great talent and passion.
So, if the choice were up to me, I would not hesitate one second: it would be Raffaele.

Yours faithfully,
Fabrizio Ticchiarelli

Ho cambiato alcune frasi ma spero di avere conservato il significato. E' una bella lettera di referenze, il tuo amico è fortunato

Raccomandation Recommendation letter - first attempt

Dear Mr/Mss, ("Dear Sir or Madam," or "To whom it may concern,")

When I read on in the newspaper about the photographer position, on a sudden one name came to my mind all of a sudden: Raffaele.
He is one of my best friends and I have known him since for three years ago. He attended a very famous art high school in Italy, and this career (can I say path or route?) gave him (not only) a good expertise in visual arts, (but also) in sculpture and graphic arts.
He is a kindly kind guy person, always smiling and careful to mindful of the problems of the people around him. one One of the major characteristics of Raffaele is his sensitivity. It is really hard for me to undestand understand how he manages to seize control my temper (is it better: to seize my mood?) all times all of the time from (through) imperceptible clues. , and I think that this is a crucial feature (trait) for a photographer that has to catch the moment to take good shoots shots.
All the people that known Raffaele describe him like as a "genius", (an) "artist", or (a) "great photographer", because just a glimpse on of his works gives you the perception of his talent and passion. 

So, if the choice was were mine, I would not have (any) doubts about who deserves the position: Raffaele.

Yours faithfully,
Fabrizio Ticchiarelli

Very good, Fabrizio! I tried my best to color code things:

Red - corrections

Blue - suggestions

I'll explain my corrections/suggestions the best I can.

"Dear Sir or Madam" and "To whom it may concern" are openings used normally when the name of the person who will receive the letter is unknown.

When referring to printed text, we use the preposition "in" ("I read/wrote/saw in the book/magazine/newspaper") unless something is physically on top of the object ("My cat's sitting on the newspaper").

For "on a sudden", the phrase you would use is "all of a sudden".

"Since three years ago" is better written as "for three years". To express a time duration, we use "for" followed by a time expression (five years, two minutes, etc.).

The use of the word "career" sounds a bit strange because normally in English, a career refers to one's professional career after school. It would be possible to say "his studies".

"not only" and "but also" are phrases that are used together. If you use "but also", you have to use "not only". You could, however, remove both of them from this sentence and it would be correct.

"kind" instead of "kindly" because adverbs don't modify nouns, and I chose to replace "guy" with "person" because the word "guy" may be slightly too informal for a letter of recommendation.

I chose "mindful of" (to be aware of) because I get the feeling that this is what you want to say. What I understand from your sentence is that your friend is aware of other people's problems.

"One" was just a capitalization issue, although I'm sure you didn't do that on purpose. :)

"Seize my temper" was a little hard to understand at first, but I would suggest you say "control my temper". That is to say, if you mean that he can calm you down when you lose your temper.

To me, "all of the time" sounds more natural than "all times". I think it would also be right to say "always" before "manages" if you preferred to use "always" instead of "all of the time".

I suggested "through" because I feel like you're saying that he controls your temper by using imperceptible clues. So, "through" would work nicely here.

I also decided to split the one long sentence into two sentences to avoid a run-on sentence. ;)