68 gbs of app's on the HDD but there is no where near that amount as the mac book air is only a week old

Hi - I recently migrated to Mac from a PC (about a week ago) and I noticed today that the HDD is nearly full already. There is no where near this amount of data on the HDD and I am confused as to what the Time machine is doing for me. I have two seperate external HD, one for my picture and the other for backing up the full system which I would normally have done twice monthly on my PC. I did notice that the Photos was huge so I migrated to the second EHD but all this seemed to do was allocate this space to applications as the amount of free space on the Mac didn't change at all.
Can anyone please help me to understand why this is happening in the first place and secondly how I can in the future keep a better control on the free space I have?
Many thanks for any assistance

This is the screen shot of the HDD Storage

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