SoundCloud's Visual Player is the default on Tumblr to include the artwork for any track or playlist that you share.
You can share to Tumblr by clicking the 'Share' button underneath the track's waveform and then clicking on their icon to send it out to your Tumblr audience.
Manually posting to Tumblr
You can manually post to a Facebook page you manage, or to your personal profile page by copying the track or playlist's URL and pasting it on the Facebook page’s timeline.
You can manually share to your Tumblr by copying the track or playlist's URL and pasting it into the Audio section when creating a new post.
Tumblr also allows you to use tags to help users discover new tracks. ‘Music’ is a good place to start; include your genre, name and the subject matter of your track or playlist, too.
Automatically sharing to Tumblr
If you'd like to automatically share to your Tumblr account, you can connect your SoundCloud account to automatically post the tracks you upload. To do this, sign in to your SoundCloud account and go to your Connections Settings page. Click the Tumblr button and sign in to your Tumblr account when prompted.