Radiator contains some oily substance in it, what's that? Since oil floats on top of water so clearly you can see its present in radiator...
Secondly looks like oil control ring is unable to hold the oil & its burning or the ring has seized and is not moving...
Too much oil residue on plugs. Compression test kia kya values hain? Wet & dry dono ki???
& nai karwaya to this is must, since your engine looks its in critical condition.
You've less time to save it. So get ctest done ASAP!