You need to tell us Adobe's reasons for each picture.
photo 1: Bad composition. What is the subject?
photo 2 and 3: Too saturated. Object movement and focus. Chromatic abberation.
photo 4: focus
DSC_6933 looks like an accidental exposure while removing the lens cap or something. Accidental exposures sometimes happen but I would never submit those shots to Stock. 😱
Coqueiros 2 has focus and fringing issues.
Always examine your images at 100-300% magnification.
Keep working at it. Better luck next time. 🙂