Hey Franco, I added a picture with a few point outs on it with my 288 to show a bit about polyflow.
The lines show a bit about flow, youre line go's down all of a sudden , while when I look at photo's it looks like a completely round arg and it flows out from that. This also works better ones reflections kick in.
The circle shows a nifty trick to lower the amount of rows on areas like you're bumper. Since that amount of rows is 1. not needed and 2. it makes surfaces bumpy really fast :p
Myer, hope this helps a bit.. I rly suck at explaining stuff