Q&A for How to Write a Biographical Sketch

It's your choice. It is not required to be in paragraphs.

You can write in first or third person, depending on whether you want to give off an impression of being distant from the "you" in the sketch. Write two versions and see which one you like better.

It is not required as long as your description is appropriate. But yes, to make it look pretty, you can surely include some illustrations.

Yes, you could definitely do this if you wanted to keep the identity of your subject hidden until then.