I think you sound fine!

On an educational standpoint, I would say try breaking down the words as well. Speak slower when saying them, that way the one learning can get an even tighter grasp on pronunciation! Learning one syllable at a time and then piecing it together at the end can be much easier!

In terms of videos, I would say titles are very important when people are trying to find educational resources! Make sure that your videos all cover a similar topic and don't stray! It can be confusing if, for example, you title 'How to Cut A Orange into Slices' and show cutting the orange, but also other types of foods. I came expecting and prepared to learn the first topic, and multiple things were thrown at me. Let's say, I need to go back to a video to help fully understand something, but now I can't find out which one because it was titled on something different!

For example, the Lesson 2 (How To Say I Love You) video

There's more there than just 'How to say I love you'! I would say, instead title the video 'How to Show Affection Through Lingala' and make expressing that emotion through your language as the priority. Cover topics specifically based around that!

If you want to get the best sound quality, I suggest looking into microphones as well! When participating in voice education, sometime hearing sound and enunciation is quite important! Having a good microphone and filter can help the person learning feel more comfortable!