Media descriptions are a hard thing to get a handle on, and it's a new habit to get into.
You can follow @PleaseCaption who will yell at you whenever you forget to describe your media - it's a big help!
How to describe:
*Include the media and style ("a rough black ink sketch")
*Include the subject ("...of a woman in a field")
*Include the mood ("she looks happy and the scene is peaceful").
Tell the story of your image to someone who can't see it. 
@eylul yeah - I hate getting yelled at so it was a very fast and effective habit-former for me XD
@Curator @PleaseCaption@botsin.space danke , thankyou
@Curator @PleaseCaption thank you for this guidance!!! this is something i’ve overlooked a LOT in the past and having a brief overview of what to include really helps!! I totally neglected media and style this time around, taking notes!
@Curator @PleaseCaption Excellent advice!
@AwkwardAda @PleaseCaption Diolch :D (A croeso i'r fediverse! :D)
@Curator
@PleaseCaption saved me so many times when I was posting in a hurry. easily one of the most helpful bots in fediverse. :)