Bobby , how are they too low ?
Thats where the ladder should go surely , unless of course you have one of them new hovering stand off gadgets from the guy who does the wheelie bin systems 
Rich
if you are a windie who puts ladders below the sill, you would place it on the wall as high as poss,otherwise you wont reach /the marks look too low in the photo unless it was a novice windie
i personally always place ladder on the sill, with a protector to stop marking (pipe insulation) then i am away from the glass and can climb far higher to reach
having said that i did see a windie with his below a sill, but thats a VERY UNUSUAL sight