Hi there, Bosa! Long time i haven't come in your page.
Let's begin, then.
So, your friend(or whoever he is), TripleS, played the violin. Well, he did an excellent, and i know what i'm talking about, 'cause i'm a violonist myself.
About the mood, well, there's plenty of ways to interpret it. In fact, i think you didn't aimed a particular mood, didn't you? So, yeah, i can't really say how do i interpret your song.
And at last, the reverb you added on each instrument is really an essential thing. It would sound empty without it. Oh, and the pause between the two parts was a bit long, but nothing serious.
Well, i think i said it all. No advice to give, really, you do know your stuff.
Just keep up the great work!
PS : i'm currently releasing a new series of songs, called "Major Arcana". I just thought it might interest you.