Here's my list. Please add your items. 
Addendum
11. READ the screening results e-mails! Sometimes you may find there some helpful comments from screeners.
12. Do not appeal every rejected picture. Ask for help on the forum, learn from your errors.
13. Never ask to pre-screen a photo in the forum if already in the queue and always submit at upload size. Daily submission limit is 5 a day.
14. Do not upload dozens of photos just because the queue is short!
15. Don't go for the largest upload size when a picture is not fully sharp. Then take a smaller size.
16. You will get many rejections before you get an accepted photo. Don't take it personally. Take the rejection reasons, and LEARN FROM THEM!
17. Screeners are human, so yes, they do mistakes.
18. A pre-screening advice is not a 100% Guarantee of the final result! Sometimes there can be differences.

- You need to read the upload guidelines. Then read them again.
- Backlit and Heat haze cannot be fixed. Period.
- 99% of “Too much or too little contrast” rejections are “Too little contrast.”
- Auto Fill will not fully work sometimes. Always double check.
- Construction Numbers are easy to find most of the time by just using Google.
- Centering in profile shots: Aircraft must be centered vertically using the whole aircraft as reference.
- Set the Horizon using vertical references.
- CMOS Dust spots are there. Just look for them.
- f8 or f9 or above to avoid Vignette.
- Pre-screening posts and visiting the forums really help improve in every aspect.
Addendum
11. READ the screening results e-mails! Sometimes you may find there some helpful comments from screeners.
12. Do not appeal every rejected picture. Ask for help on the forum, learn from your errors.
13. Never ask to pre-screen a photo in the forum if already in the queue and always submit at upload size. Daily submission limit is 5 a day.
14. Do not upload dozens of photos just because the queue is short!
15. Don't go for the largest upload size when a picture is not fully sharp. Then take a smaller size.
16. You will get many rejections before you get an accepted photo. Don't take it personally. Take the rejection reasons, and LEARN FROM THEM!
17. Screeners are human, so yes, they do mistakes.
18. A pre-screening advice is not a 100% Guarantee of the final result! Sometimes there can be differences.
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