1. Quality looks ok on the plane, but that back-lighting makes it a tough call...
2. Ok, saw this on the first one too, but I'll comment here... you're not saving them properly, or they're getting compressed when you upload them... this is a 1500pix picture with a moderately busy background, yet the file size is only 250k. You've lost a lot of quality somewhere along the line... look at the sky and how blocky/pixelated it is if you equalize... Other than the quality issues, not sure the motive will pass and/or distance might get you too.
3. Same as 1 & 2... this file is less than 100k! You've got really noticeable JPEG artifacts above the tail light and other places. Besides the compressed/poor quality, needs more contrast, and is still a bit blurry.
4. Same as above... and this file is only 70k!! Should be at least in the 300-400k neighborhood.