Does my hairline look like a doll hairline? And any chance for him to get any thicker? (Photo)

If you are not satisfied with your surgery results, it is best to follow up with your doctor and express your concerns.Photos do not look like a "dolls hair line".

It is difficult to judge based on the photos you provided but it does not look like "doll's hair". More than likely you will want to add more density to the hairline but I would wait another 4-5 months for the full result.

It is difficult to tell form the low resolution of the photos. I would suggest scheduling a follow up with your surgeon if you are unhappy with the appearance of your hairline. 

hairline is the hall mark of a hair transplant and it should be natural and un-detectable.Put some more grafts in another session and make it irregularly regular..
new hairs keep coming till 12 to 14th months... 

Your hairline is OK, but the surgeon did not build a soft transition zone in front of the hairline which would have made it softer