Unfortunately DIS doenst have blend modes in the same way that Photohsop or PSP does and for that particular task they rae fairly essential however try this as an approximate and you can tweak
Choose a photo
Make a duplicate so there are 2 in the stack (2 of the same pic on top of each other)
Apply Gausian Blur to the top layer A value of about 5- 7 should work
On teh same layer choose Effects> Filters> Ink Outlines and apply - go to Change Advanced Options and increase the transparency to about 60 and choose Ok
Then go to Effects> transparency> Gradual and choose the Circular gradient - Done
Now make a duplicate of the bottom (original picture) and drag it to the top of the stack - Effects> Transparency> Even
Decrease the transparency to suit -prob somewhere between 40 and 70%
You can fiddle with all these parameters of course

HTH - feel free to ask if you have any questions