Does this do it?

Sub CropResize()
Dim osld As Slide
Dim oshp As Shape
Dim x As Integer
On Error Resume Next
For Each osld In ActivePresentation.Slides
If osld.SlideIndex > 1 Then Exit Sub
For Each oshp In osld.Shapes
If CheckIsPic(oshp) = True Then
With oshp
.PictureFormat.CropLeft = 100
.PictureFormat.CropTop = 55
.PictureFormat.CropRight = 70
.PictureFormat.CropBottom = 100
.LockAspectRatio = msoTrue
.Height = 100
.Top = x * 100
End With
x = x + 1
End If
Next oshp
osld.Shapes.Range.Align msoAlignCenters, msoTrue
Next osld
End Sub

Function CheckIsPic(oshp As Shape) As Boolean
If oshp.Type = msoPicture Then CheckIsPic = True
If oshp.Type = msoPlaceholder Then
If oshp.PlaceholderFormat.ContainedType = msoPicture Then CheckIsPic = True
End If
End Function

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