Minor Harmony doubts [duplicate]

Question

I've tried written a little chorale in four parts using minor harmony (Bb minor).

Established that for sure I have done several harmonic errors in terms of parts motion in the sense of traditional harmony, I have some troubles understanding some degrees which I intuitively assigned to some chords that I wrote (which correspond to the highlighted parts).

Basically I started with the melody and I decided to keep it without doing any further modifications. So I harmonized keeping in mind the chords I wanted to use for each section by completing the harmony and also choosing some inversions for smooth bass movements.

QUESTION: Is it possible to MIX the harmonic possibilities (triads at this level) given by harmonic/melodic/natural minor together freely? Because I've done that depending on the melody note.

The highlighted notes.. they are not present in the harmonic possibilities notes of Bb minor, So I considered them as chromaticisms.. And I intuitively harmonized them using diminished chords.. Is this a common behavior? And if yes, why? Also, since diminished triads I used to harmonize them are not available in Bb minor, which degrees should assign to them?

Answer 1

You've asked a lot of this already HERE

Same answer. Yes you can freely mix all forms of the minor scale.

But you've asked some new questions too.

Yes, diminished chords are often chromatic.

You've broken your own rule by departing from B♭ minor in bar 5!

But, all 'theory' apart, have you PLAYED this? Do you like the sounds you've written? Do you really like the Db in the second chord of bar 5? Do you think the voicing of bar 1 sounds good? And quite a few similar questions.