Looks like you lost the front seal and have a leak.
Really can't tell how big untill you recgarge it.
I would try to get someone with gauges so you can add the right amount and see how well it cools.
If it factory air then you have PAG oil.
SInce you have some freon in the system then you need to by the oil in a small 2oz pressurized can.(But you have no idea how much you lost)
To be honest with you if you don't have the right tools then take it to someone who knows MCAC,replace the seal or install a quality name brand compressor,flush the system,and you'll be set.
If you want to try to add freon then do it very slow and see what happens.
GL
Vegas/

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