The shadows on the baby are far darker and sharper than the shadow off the duck. There is also a light shadow off the top of the duck which is totally out of place. The light source on the baby is very bright, while there is no real light source showing on the duck. You can try to use the Dodge Tool to create the light value refraction on the duck, but the shadows will need a lot of work separately.

the ducky looks flat, add alittle white (or near white-yellow) shine at the curved portion (example, the head area) and part of the beak..

the baby don't seem to be interested in the ducky, should find one that looks at the ducky

That is a cute image anyway.... good luck.

Ahhhh how sweet, the baby is so cute, God bless! Best of luck author!