Is this scar normal around belly button? (photo)

Thanks for the excellent photos. In the close-up picture it appears as though you are starting to get a hypertrophic or keloid scar on the left side. The right side looks like it is healing nicely and as long as you keep it from sun exposure it should heal into a fine line. The left side however should be addressed sooner than later as worsening of this scar can potentially be prevented. You should talk to your surgeon about the potential to use silicone products, pressure garments or even steroid injections to improve this. 

From your photos it
appears as though you are developing a hypertrophic scar (aka keloid) on the
left side of the umbilicus. You should see your plastic surgeon sooner than
later to discuss treatment options. Commonly surgeons will inject it a keloid
with kenalog to reduce and minimize it.

You appear to be developing some hypertropic scarring.  Do let your surgeon know, so he/she can inject the scar with a , Kenalog, to minimize it.