Spark Plug and Compression Check

I've been trying to decide what might be causing the puffs of blue smoke and extra oil consumption in the Mustang.  I decided to pull the spark plugs out to check them and run a compression check on the motor.  The compression was very similar across all of the cylinders so the rings have sealed well which is good news.

This is the driver side spark plugs from cylinders 5-8 with eight being the closest to the camera.  You can tell that cylinder number 7 is having a problem of some type. 

This is the passenger side with cylinder 4 being the closest to the camera (basically in the same orientation they came out of the engine).  You can tell that the third cylinder is also having the same problem as cylinder number seven.

I ordered replacement plugs for cylinder 2 and 7.  I'll need to figure out what is going on with those two cylinders.