I would like to get it out of the way so, I felt your first video was too long, simple editing would shorten it.
You could make the video then remove the audio, do a voice over and edit out the parts where you have noting to say.
When you first announced that you would do a tutorial series, I wondered where you would start.
By the time a artist reaches the point that we don't fear onlookers judging our art, we have forgotten the questions we first asked.
You chose a really good place to start.
It isn't for those who pick up a pen for the first time, when someone draws an apple and asks WHY! doesn't it look like a apple, then thy will value these tutorials.
The second video was great, I found it interesting how the silhouette differed from the "rough sketch and refinement" method often taught.
In your future tutorials you should introduce each new step and then apply it to the owl image, showing watchers how each step builds on the final.
You should remind game developers why this is useful to them, at the beginning or end you could show a piece of level art or game character that thy could make after watching.
Topic ideas:
Form and shape, how thy influence shading.
How the thickness of lines can change a image.
How to plan moving parts.
Drawing a pose.
Color and contrast.
Geometric and Organic drawing.
Anatomy.
Choosing a art style for your game, and sticking with it.
List of simple art tips.
Simple daily exercises to improve your art.
It is always good to review the basics, and you could even learn a thing or two that was missed, I will continue watching and learning.
Thanks for the great tutorials.