"un dessin" means a drawing, especially one you did using a pencil. "tu veux un dessin / tu veux que je te fasse un dessin ? Il faut te faire un dessin ?" is a somewhat disparaging sentence (sometimes threatening) intending to say that you're understanding nothing and that you have to leave / do as you were told.
The phrase 'le dessin' may mean the design. In the word-by-word translation, the definite article 'le' means 'the'. The noun 'dessin' means 'design, scheme'.
drawing, artwork
You have art on Tuesday
'Dessin'
le dessin
The drawing.
In French, 'dessin' translates to 'drawing'.
Ratatouille, that's the movie, an animated movie.
'Dessin' means drawing, or art, in French.
doué dans le domaine de dessin
Marcou. has written: 'Le dessin et ses techniques'
Colette Jourdan-Ionescu has written: 'Le dessin de la famille' -- subject(s): Dessin d'une famille, Test du