#protogen picrew

Here's the method i used but ill also give an easier alternative!

I started off by pasting a dotted pattern on a new layer, Medibang came with this pattern built in but you can look up transparent dotted textures and copy and paste them instead. Close-up to show the pattern better-

I then drew the face i wanted with a smooth pen tool on another new layer, and selected outside of the face. Going back the dotted layer i deleted the outside, leaving the dotted pattern in the face shape. you can delete the layer you used to draw the face with the pen afterwards.

You can probably leave it at that if you want, but if you want the face to glow i suggest following this tutorial: https://www.deviantart.com/chicinlicin/art/Glow-Tutorial-201366137

Heres a simpler method as well:

if you have acess to a dotted brush like the ones below you can simply draw the face using those

if you wanna add more effects to it to appear like a screen i suggest adding an LED filter over top via copy and paste and putting the layer to overlay or screen. you can look up "TV effect" to find the ones i use.