Uploading artist image and general newb question

Hi. How do I upload a main artist image?

Also, I’ve read that MusicBrainz helps with an artist’s google SEO and general searchability. Is this true? What are the practical applications of entering artist info and discography into MusicBrainz beyond the MusicBrainz site?

MusicBrainz doesn’t store artist images, only album artwork (unless, of course, the artist appears on the cover or booklet).

Check this blog post, which explains why: