Translation:The girls are drawing on the wall.
Is 'väggen' not 'the road' or 'the way'?
No, that's vägen. Important difference!
Any difference in pronunciation?
Long vowel vs short vowel. Changes meaning drastically in many Swedish words.
vägen long vowel http://sv.forvo.com/word/v%C3%A4gen/#sv
väggen short vowel http://sv.forvo.com/word/v%C3%A4ggen/#sv
Edit, PS, also the consonant is longer when it's doubled.
The graffiti girl
Why not "the girls draw on the wall"?
That should be accepted as Swedish doesn't distinguish between the present tense and the present continuous tense.