Should I ask to get my crowns adjusted/remade for not matching my teeth? (photos)

There are many excellent materials that allow for a perfect matching of natural teeth. From what I can see from the photos you should be able to get a better cosmetic result. Speak to your dentist and ask about Zirconium with porcelain for implant crowns,

Hello, that’s the material of the crown… I recommended you if you want chance it you have to do another crown with material more esthetic like zirconia or pure porcelain. 

I am not completely sure what is the material used in your
crowns but I think the esthetic of them can definitively be improve, compare
with your natural adjacent teeth your crown seem to have a solid and
opaque color and your teeth are glossy and have a degrade color, this
means the margin of them is slightly less white than the edge this effect can
be obtain with zirconia fused to porcelain crowns because the
porcelain coating the zirconia is manually placed this technique is very
artisan and done by a good technician the results are very good in my opinion
is better to replace them.