Wow, Johann!! That's really really good. I'm glad to see you have grown a lot as a composer, this shows great skill in harmony.
You should learn the trumpet.
A couple of parts, you have written your trumpet on really high notes, to be held for long times. This is never a good idea. Written high C is a stretch for most amateur players, and you have written a high E, and the high D to be held at the end is a little bit much. Although it's not impossible, I wouldn't be surprised if something were to go wrong in a performance, in the trumpet section. But other than that, your orchestration was pretty good; although you did rely a little bit too heavily on the string section. The strings bring a good texture to the scene you have portrayed, but it's constant, and I feel that limits the piece. Your scene was portrayed very well, but there was no variance to it! It was too streamlined, with one melody, and repeating motifs...you just didn't really get creative with it all!!
Also, at 136 you have asked the same percussionist to play the snare while rolling the cymbal...I don't know about you, but I would need three hands to do that, and four to do it well.
Another thing--the chords you have used were
not secondary dominants, they way you used them! G minor to A major is a common progression, but the A major is not a secondary dominant if it isn't being used as a dominant. This chord progression is commonly used to hint at the key being the dominant, but with G major. G-A-G-A etc, then eventually landing on D major for a bridge, sort of surprising the listener with the tonic. Or, it's used to hint at the key being actually A major, with the lowered 7 chord, G. An example of this is 'Sweet Home Alabama' (D, C, G). It's a nice sound the way you have done it, and it matches the idea of walking by yourself perfectly! Also, I like the tritone progression you have used here and there, as well.
Oh well. It's very good, and I'm scared for my piece now...!
I guess I should upload mine, huh? Maybe I will later today.