Driver fender is a hot mess...
For the body lines after you get things as straight as you can. Put a couple layers or 3/4" body painting tape just at the body line you are trying to shape. Then fill down to the tape from the top with bondo. Peel the tape just as the bondo is setting. Now do the reverse on the top side of the body line and fill it up from the bottom.
Keep going back and forth like this until you get your body lines up to grade and straight.
Use the tape at the body lines as a guide as you are sanding it straight, this gives you something to follow.
Same with sanding the primer surfacer work as you are working to keep the lines straight.
Just like in this this photo below.
For the body lines after you get things as straight as you can. Put a couple layers or 3/4" body painting tape just at the body line you are trying to shape. Then fill down to the tape from the top with bondo. Peel the tape just as the bondo is setting. Now do the reverse on the top side of the body line and fill it up from the bottom.
Keep going back and forth like this until you get your body lines up to grade and straight.
Use the tape at the body lines as a guide as you are sanding it straight, this gives you something to follow.
Same with sanding the primer surfacer work as you are working to keep the lines straight.
Just like in this this photo below.