My wife is a middle school art teacher. Here is her advice:

You have to learn to see before you draw. Get rid of your preconceptions about the appearance of objects and trust your eyes. Look first for outside lines and look for proportions.

Draw an object on paper without looking at the paper. Follow the outside contour lines of the object with your eyes, at the same time drawing on the paper. Your hand should mimic your eye movement.

Then draw the same object by looking at the paper sometimes.

Then begin looking for lights and darks.

Practice, practice, practice.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13