A bit late for this, but here’s my ghostly pumpkin.
You need to either brighted up the ambient lighting a little or make the background darker. Right now they seem inconsistant together lighting-wise.
Love it!
Really nice pumpkin - the center of the picture. 
Did you use particles to make the fog?
Good picture 
A background will be good ( a dark forest for example ). The pumpkin is “beautifull”
Is that Suzanne!? Nice pumpkin!
About the light, Kansas had a point there, and it seemed too plain anyway. So here’s another version.
Background art is a modified image of a Karen Williams Edelmann painting.
Brrr ! scary environmeent Here 
the ground is more clean
Thats really good
Great work, I really like the atmosphere.