You never use BLOB for images your database will become very havy.
You use db to save the filename and you upload the files in a directory on your server.
I suppose you are making an "admin" section for your users. Apart of creating the whole thing by assigning users/permissions and using session to keep track who is uploading what etc (i wont go into this part) you need to use DFP2 to upload the files.
Check the Tutorials of DFP1 so you get the general idea how DFP works with DataAssist and then read DFP2 Help to see the changes in the new version.
In general you replace the Textbox of the DataAssist wizards creation (the image textbox) with a file browser using same name. You apply a DFP2 file upload behavior and progress bar and then you edit the Insert/Update transactions (depending on which page you are editing - you need to edit both by the way) and you change the assignment of the image field to the binding of WAUpload recordset instead of the form it has.
For the update page you insert a new file field/browser and hide the textbox allready created so u keep the old filename in case you dont change the image.
Hope this post was helpfull