Hi,
You can use the following PowerShell to enumerate all the profiles looking for profiles that don't have the pictureUrl set.
*you'll need to change the url to that of your central admin site
[void][reflection.assembly]::Loadwithpartialname("Microsoft.Office.Server") | out-null
$site=new-object Microsoft.SharePoint.SPSite("https://c05470sp10:7443") #Central Admin site
$servercontext=[Microsoft.Office.Server.ServerContext]::GetContext($site)
$site.Dispose() # clean up
$upm = new-object Microsoft.Office.Server.UserProfiles.UserProfileManager($servercontext)
$pc = $upm.GetEnumerator()
foreach($p in $pc){$v = $p["PictureUrl"].Value;if($v -eq $null){Write-Host $p["AccountName"].ToString()"doesn's have a picture set."}}
#Optional, display all the Picture URL's
$pc = $upm.GetEnumerator();
foreach($p in $pc){$p["PictureUrl"].Value}