When you upload an asset picture, the image is added to the Program Files (x86)\Lansweeper\Website\assetpictures folder on your Lansweeper server and the ID of the asset (tblAssets.AssetID) is used as the image name. The image isn't stored in the database itself and there's no specific database field that stores the full file name. TblAssets.AssetID is used as the image name.