The pdm_picture_util command is the command you can use to do this.
1. Create a folder on the sdm server to hold the pictures you want load.
2. Store a picture in this folder (Picture size < 100kb)
3. Find SDM mdb ca_contact table, locate the uuid for the contact record you want associate the picture
4. run this command to load the pictrue:
(example to load a jpeg for Administrator contact (different uuid for sdm installation).
pdm_picture_util -add ""D:\\Pic\\meparis.jpg"" cnt:7C42A255833AB84A89E