Once again, thanks for your detailed comments! You too gms5287!
I am going to change the tempo markings, because you are right. It's way too low, lol!
Dynamics were written with consideration of the real instruments. I had no interest how they sounded in Sibelius. The type of "abbreviations" that I used was borrowed from a book with a collection of orchestral compositions that I have which I quite liked. What I omitted though, was to paste the name of the instruments on the following systems and staves as well which I'll probably do. I think then it won't be misleading.
Sextuplets are two triplets in one, quintuplets are five notes in place of four (for example a quintuplet of quavers replace four quavers. If I wanted a quintuplet to replace 6 notes I would have written the tuplet as 5:6) and the duplet is two dotted quavers. I wrote it that way, because it looks better. To tell you the truth, I've rarely seen ratios instead of numbers been written on tuplets. I've only seen ratios been written only when there is no other conventional way to write the tuplet, as in several tuplets in the septet (9:7, 15:16).
My beaming follows the phrases of the melody and act as micro-metres (I don't know if that exists, but it's why I use the irregular beaming). That's why there are some clashes in places which I don't find necessarily bad. It appears frequently in the music literature of 20th century actually.
Lol, you are right concerning the mixing of terms. I just write the term I want in the language that I know how it is said. I can't speak German very well yet so I don't write anything in German (I've only been learning the language for a year). Cuivré means brassy, correct. It's written that way in Samuel Adler's orchestration so I thought not to change it in English.
I'll upload soon the revised score. Thanks again for your comments!
Alexandros
Edit: I forgot to reply to your comment regarding held notes. They are notated that way so that I can indicate where exactly the crescendo or diminuendo begins. I couldn't find any other way to do it...