Ok, so to preface, I am in a church choir for a TLM, (and I'm also in the Schola Cantorum so I'm trained to sing the Gregorian chants at Mass, just to brag a little 😏.) Anyway, I was anticipating more traditional style Latin motets, and I'ma be honest with you, the Novus Ordo style with the piano and such makes me really quite uncomfortable, but I said I'd give you some feedback, so I'll try my best. Just beware, I'll probably give very old-fashioned advice with a large bias for Latin Mass aesthetics, so just take what you think is applicable.
The Assumption:
The voice leading on the SATB part is fine, so no criticism there. I do find the bass part really high though (I am bass myself.) At moderate or louder dynamics like this, it will sound strained, even with higher bass singers.
The piano part and flute part I think just add mud and uncomfortable dissonances. The piano part isn't even well written, just looking at it as a pianist myself. Especially since these are supposed to be motets, I'd nix the instrumental parts entirely, except maybe an optional organ reduction.
Finally, the engraving is just really... unproffesional. First of all, the tenor should be in treble clef, unless it's a reduced score. I can't imagine trying to read all those ledger lines! The lyric syllables are divided incorrectly, which made it very awkward to read. Here's a guide: Syllable Rules: Divide Into Syllables, and here are all the syllables of this first motet divided properly: Ma-ry is as-sumed in-to heav-en, Moth-er from Earth, now Moth-er of all! Look at the an-gels gaz-ing up-on her, prais-ing our God for the wom-an He made! Al-le-lu-ia, Hail our Queen, Mar-y! Moth-er you passed through the gates, but you're nev-er too far a-way. Will you show us you're near? Hear our prayer! etc. Other engraving nitpicks, page should be portrait not landscape, the scaling should be larger, it's standard and preferable to include the voice range and instrument names, dynamics in vocal music fit better above the staff, and we need a square bracket! I could probably find even more nitpicky stuff if I looked, but this is a good start.
Come Holy Spirit:
The plain song bit makes this a little more tolerable, but a suspended cymbal in liturgical music?? 😭 I digress.
The voice leading here is also fine.And I echo the criticisms of pateceramics, competent choirs will stagger long held notes, regardless of instruction in the score. And the part about the Gregorian chant being off meter. If you do this, please write it unmetered or with partial barlines like in actual chant notation on just that staff, and in each of the other voices just have one whole note under the entire chant solo. If that doesn't make sense, I can sketch up an example for you, but that should be clear. This is also an engraving problem btw, so as you improve your engraving skills, you'll learn how to engrave less commonplace moments like this. What I explained is just what I would do, but there are certainly other ways to handle it.
Both these motets, but especially this one, have the issue of feeling stagnant to me. Like they sit in the same I-IV-V range of the tonic key and really don't move anywhere else. This isn't necessarily a bad thing, but it makes for music that can sound uninspired and unoriginal.
Sorry if this all is too harsh, I promise it's in good faith and I hope you are able to take this criticism to heart and let it help you improve as a composer.
God bless, my friend.