You probably need to add some sort of light wrap. Here is how I do it, you need to first duplicate your layer :
1- Make sure you precomp the layer on top
2- Apply a blur
3- Inver Alpha
4- Fill with color white (because your background is white)
5- Apply a CC composite and set to stencil alpha (or silouette, I always forget which is the one)
6- Set it to add or screen
Let me know if this makes sense