Better main page
EDIT 7 Dec 2019: The home page was updated once again thanks to the constructive criticism by @jsmith_dev on Reddit.
The new and (hopefully) improved home page is up and topics pages are also updated. This improves discoverability quite a lot.
If your article has a nearly gray image - that's the default thumbnail that uses some word in the title and unsplash.com.
If you want a better image - just add it as the first image in the article (anywhere, it doesn't have to be at the start). In a few days we'll add "Lead image" feature which will allow you to upload an image specifically for the thumbnail.
One small note - if the image is too white - we'll darken it a bit so it'll look better on the main page.
Have fun!
awesome look