1. what program do you use?

i mainly use CLIP STUDIO PAINT, sometimes i use AZPAINTER 2 or PIXIV SKETCH (the "simple" version, formerly known as DRAWR)

2. what brushes do you use on clip studio?

i use turnip pen which is a default brush in the ink section, i have 2 copies, one that's small and always 89% opacity and another that i use to paint that i change size+opacity according 2 my needs .. i also use the default airbrush sometimes!

3. can i use your art for my icon?

yes! credit is cool but not required

4. do you still use instagram?

i'm inactive, i don't have the app installed on my phone ..

5. what happened to 8eyes?/where can i read it?/what happened to x character?

8eyes is still ongoing, as an experimental project the updates are sparse while i work on larger more cohesive narrative projects,

if you are asking about the tumblr comics, 8eyes is no longer in a traditional webcomic format and the tumblr version is not considered canon,

the characters are slowly being introduced & redesigned to the new version :)

you can read the new 8eyes here