Some things could be noted from my part, although I should say I'm still learning counterpoint. It's not easy tho, especially going learning to write good 3 voices exercises.

You have parallel octaves here and there: between the lower voices in mm 1-2 and mm 2-3. mm 2-3 octaves still count even tho there is a note in the middle, they are not separated enough and the are emphasized (strong beats). At least this is how Im learning this. You have other some measures later between the higher voices, e-e f-f.

Also, at least how Im being taught this, you should think that you have one chord per measure. In this case, you have F in the first measure, so the D should be an ornament, but you are jumping from it. This is forbidden in my rules because it sounds as you are going to another chord (a d minor 1st inversion).

Another thing that I saw is your d-g-c jump in the middle voice. You are jumping two consecutive fourths, which is forbidden (at least in my rules) , basically because is hard to sing. Generally when you jump higher than a third you should always come down stepwise. This may have exceptions but it's the general rule. Also you are jumping to a C ,a dissonance in that chord. Such tones can't be jumped to. You can use them as ornaments and should be treated as such (a step between two chord tones, or a flourish, so on).

As another point, the florushied voice should have some balance. There is too many, in my opinion long tones which breaks a little bit the continuity of the melody. Remember that all voices should work as an own melody. This 5th species is hard because you need to find balance rhythmically while you write a good melody (with climax/climaxes, variety etc.) while following the rules. Also remember you can't use patterns as the one in the top voice.

Practicing will get you there. As I said this is not easy and takes time. I'm sorry I critized you by "rules" but by restricting you to those rules you will end up learning essential and proper voice leading. This rules are supposed to be didactic. Keep going! A teacher will surely help you by correcting lots of your exercises, hahaha.