Comment on the Strauss piece
It is a good job and I like how it sounds; you were able to see firsthand that economizing means not automatically having little to say.
Clearly, the bar of difficulty is raised because if you put in a lot of something, it will inevitably be liked (but the opposite is also true); instead, if you take elements of the material and develop them, you are more exposed, but the result can also be rewarding.
That said, I would still work a little bit just on the first 13 measures.
I don't find the first 31 so painful, but in this part there are a couple of flaws:
the first is at measure 10; the pause confirms that of measure 5; I read that many people didn't like it, but that clear F major chord is too banal.
the second is the seam (measures 12 and 13) with measure 14... the triplets begin; at measure 13 you made a pause... use it to launch the triplets or alternatives right then and there. That is the best point to make "anything" happen (which should then be elaborated, mind you!) ... so the worst thing is to let nothing happen.
If you refine something in these very first measures, in my opinion, the whole piece will benefit; consider that the beginning is a bit of a calling card, it's a shame that a couple of little things make it seem understated... the piece is not!
In general, having achieved this first conquest (fully utilizing the elements of the theme), I would start working on another aspect (I know you are hating me right now). The contrast for the B (or the second theme) is perfectly fine, but, aware that it is difficult to explain and make understood, it would be nice if the B were somehow related to the A. A kinship bond that can be achieved in many ways and not necessarily through melodic resemblance. I am referring to rhythmic content, harmonic content, melodic movement, texture, etc.
Something that says A and B belong to the same piece... I'm not talking about "copying" as an examiner might do to prevent a candidate from bringing the B from home, but precisely to strengthen coherence on this front as well... which doesn't mean making a coherent B, but one that is contrasting yet (let's say)... related.
If you were to have this need yourself, and tried it with your own theme, you would realize how profound this concept is... of course, working on someone else's idea is even harder, because it practically means following in the wake of a given idea (and not our own)... but in the end, what matters... when someone listens?
I think that everything must have its own coherence, that one should gradually move from one point (the starting point) to another (the closing)... without "excesses". Obviously, this is a point of view, perhaps even a matter of taste, but composed pieces congenitally have this characteristic, with many nuances, but taking any B that might come to mind... if someone says