well done
considered your age, your much better than many musicians.kind of strange choice for sounds you use,but not bad.you can work more on mixing,is kind of rough,you can do some panning triks and for"classical" stuff you may use more "classical" sounds (orchestral samples).was strange that you have a drum in the begining and then,that dissapears...well,for your first "classical" stuff,is very promissing.keep on (and btw,you didn't miss any note here...:)