Do you have a picture of your tattoo? Post it so I could take a look at it
.After 2 sessions you should have significant fading and it would appear blotchy in places.
Without seeing a pic the only thing I can think of is the frequency of the laser isn't high enough. What usually happens is each time you go they set the laser on a higher and higher level. I would talk to whoever is doing this for you.
Contact the person who did it. We can't help you here.