i think the hacker's reason for posting his art is fine, and his option to better himself independently rather than on the advice of others is also okay, although it will probably make for much slower improvement.
but i've got a problem with this:
I also do this purely for fun, unlike most people.
this is most people. there are a lot of people in this thread who are asking for the advice of others to get better at art for little to no reason. they just aren't often noticed because they are the average person.