Drawing style

Illustration 1
Students (boys only) about 15 years old setting in a computer lab facing inward, working on their computers with engagement, some of them are wearing headset, one of them is raising his hand as if he wants to ask the teacher.
Also there is a teacher (male) talking to one of the students.
There is a teacher desk on the other side, but without a teacher.

Illustration 2
Same as illustration 1, but with some modifications.
On the wall there is a big screen with teacher talking – as online teacher.
The real teacher now is setting on his desk and watching with the students the online teacher.

Illustration 3
Same students now are setting in their classroom in groups of 5 working on a task together.
The teacher is talking to one of the groups.

Illustration 4
Same as illustration 3, but with some modifications.
The teacher is now talking to the whole class as if he is explaining something, there is smart board behind the teacher.