Exactly! In my case, Digital Marketing.

That the photography team has a task of "uploading images of the product x". When completed, the designer has his task of "adding graphic elements" and then the CM can schedule the publication.

It would be great

This is exactly my request. In fact I would like an option to make a task "Dependent" on another task's completion. So it will remain denoted as pending until it's parent task is completed then it becomes available for completion. We have this a lot in our projects (Work needs to be completed by one team and the product passed to another team for additional work; the second team cannot start their work until the first is completed. If we could easily denote this in Workast, it would be very helpful.)