I am probably failing here because I am a zombie with brain-damage (that, and english isn't my native language) but can someone tell me how to read the riddle properly and what it actually means? ;P

I am gonna list in spoilers the riddle and what I think it means, and if I am wrong, please correct me ;p

So first riddle


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In my understanding this is a ZERO / 0



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So second riddle


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In my understanding this is a NINE / 9



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So third riddle


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no idea what this means, widows legs? seasons of 2 ?



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So fourth riddle


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in my mind this is a SIX / 6 ... but it's probably wrong ;p



So basically, I need someone who knows the answers to tell me what I am doing wrong here. ;p