visual art: Draw a little monsters avatar set

[anotimpp90c2c7]

[eeshangarg]

@anotimpp90c2c7: Your avatars are great! But there are a couple of issues with your pull request:

• They are in the wrong folder. They need to be in draw-avatars/anotimpp90c2c7/.
• Also, you should not have any spaces in the names of the image files. You may use underscores _ or dashes - instead.
• This PR is only supposed to have 1 commit, not two. And the commit messages are wrong. There needs to be only one commit with the message `visual art: Add a monster-themed avatar set.

I would recommend closely following the Task Type A instructions here and making a PR again! :) If you need any help with Git, just ask on chat.zulip.org! Thanks! :)