I promised I would have a little look at your piece in detail. So here goes...
I didn't wish to interfere with your melodic writing so have focused on providing input regarding voice leading principles. Let's look at the opening motif...
(The numbers I have entered above the notes below indicate their scale degree and this useful for voice leading analysis).
A) In this opening, the bass features scale degrees 1-7-1. This pattern is typically used to accommodated a higher voice ascending from 1-2-3 respectively, while other voices may descend from 3-2-1 or maintain a pedal on scale degree 5.
The melodic line in this example (oboe) emphasizes scale degrees 3-2-3, which is a non-standard solution on the basis that this would lead to consecutive with 3-2-1 part as well as a possible ascending (1-2-3) line. It would make more sense to close the melodic line on scale 1 (F natural) to to accommodate the contrary motion that makes this opening gambit effective. Notice that the voice leading for your clarinet line is not smooth as a result of this configuration. In these situations, it is desirable to facilitate stepwise motion between the individual parts opposed to leaping about; if you are leaping around excessively, it suggests the voice leading could be improved. Finally, the bass returning to F in bar 3 doesn't need to drop to the lower octave, and the flute part can remain on scale degree 5 due to the doubling of the third being unnecessary.
Here is how the voice leading could be realized, which as you can see consists of oblique, contrary and parallel motion with no consecutive 5ths/8ves
B)
The other example I want to use is the nice melodic line from bar 11. It is quite beautiful. However, the other parts are a bit muddled. Let's isolate this part with the bass alone to see what's going on...
In several places the bass part clashes with the melodic line, especially at the end cadence. There are also consecutive octaves in one or two places. I have realized an alternative bass for you to have a look at and compare. Note that I look for opportunities for contrary motion wherever possible, while retaining the strength of the chord that is being realized (for example, avoiding doubling the outer voices). It is good practice to avoid doubling the bass and main melodic line in the interest of maintaining independence. You can double with inner, supportive parts more freely.
I have provided an audio of our respective realizations...
Here is my realization
If I evaluated all aspects of your piece in this manner I'd spend a whole day doing so! So I will stop here. But I hope you can appreciate the importance of effective voice leading in your work. Always consider the outer voices in first instance to arrive at a coherent skeleton that can then be embellished by filling out the inner or supportive elements.
If you have not yet read Robert Gjerdigen's 'Music in the Galant Style', I would recommend doing so for further voice leading instruction and especially if you like the galant style. This wikipedia page can provide an introduction to the analytical system that he advocates using (schema theory): https://en.wikipedia.org/wiki/Galant_Schemata
Feel free to ask any questions.