Originally posted by Apet-Sure Well executed shot. The colors aren't quite what I expected for a rusty screw. I see subtle shades of purple and cyan on my monitor. The bright blotch at the bottom of the frame has a blue-ish cast. Could the fill flash have caused this? How was your white balance set? This is NOT a criticism. I really like the colors just the way they are, interesting and a little off the beaten path.
The odd colors on the screw are actually lichen growing on it. The board it held down had long since rotted away so behind it you see one of the other decking boards and below it the board that is a truss for the platform. It is all probably close to 40 years old at this point so it is pretty moss and lichen covered.
As far as the white balance it was camera auto and this was shot in the shade on a sunny day with the fill flash.