Put picture to column H by selecting row number from combobox list, and fit picture to cell with align to center point, saving aspectratio
Private Sub ComboBox1_Change()
    PTstop = Me.ComboBox1.value
    PicPath = Worksheets("Sheet1").Application.GetOpenFilename("*.jpg,*.png,*.jpeg,*.gif")
                    If PicPath <> False Then
                        With .Pictures.Insert(Filename:=PicPath)
                            With .ShapeRange
                                If .Width > .Height Then
                                    If .Height >= Worksheets("Sheet1").Cells(PTstop, 8).Height Then
                                        .Height = Worksheets("Sheet1").Cells(PTstop, 8).Height
                                        If .Width >= Worksheets("Sheet1").Cells(PTstop, 8).Width Then
                                            .Width = Worksheets("Sheet1").Cells(PTstop, 8).Width 
                                        Else
                                        End If
                                    Else
                                        .Width = Worksheets("Sheet1").Cells(PTstop, 8).Width
                                        If .Height >= Worksheets("Sheet1").Cells(PTstop, 8).Height Then
                                            .Height = Worksheets("Sheet1").Cells(PTstop, 8).Height
                                        Else
                                        End If
                                    End If
                                Else
                                    .Height = Worksheets("Sheet1").Cells(PTstop , 8).Height
                                End If
                                .Top = Worksheets("Sheet1").Cells(PTstop, 8).Top + Worksheets("Sheet1").Cells(PTstop , 8).Height / 2 - .Height / 2
                                .Left = Worksheets("Sheet1").Cells(PTstop, 8).Left + Worksheets("Sheet1").Cells(PTstop, 8).Width / 2 - .Width / 2
                            End With
                        End With
                    End If
End Sub     
Code to enlarge image then clicked to Right of Image, if click anywhere in column A, image should reduce in size. Not tested just as  starting point.
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
Dim rangeS As Range, picSelected As Shape, old
If Target.Column > 1 Then
    Set rangeS = Target.Offset(, -1)
        For Each picSelected In ActiveSheet.Shapes
            If TypeName(picSelected.OLEFormat.Object) = "Picture" Then
                If picSelected.TopLeftCell.Address = rangeS.Address Then
                    picSelected.Height = 250
                    picSelected.Width = 250
                End If
            End If
        Next picSelected
ElseIf Target.Column = 1 Then
    For Each picSelected In ActiveSheet.Shapes
       If TypeName(picSelected.OLEFormat.Object) = "Picture" Then
           With picSelected
                            If .Width > .Height Then
                                If .Height >= Target.Height Then
                                    .Height = Target.Height
                                Else
                                    .Width = Target.Width
                                    If .Height >= Target.Height Then
                                        .Height = Target.Height
                                    Else
                                    End If
                                End If
                            Else
                                .Height = Target.Height
                            End If
                            .Top = Target.Top + Target.Height / 2 - .Height / 2
                            .Left = Target.Left + Target.Width / 2 - .Width / 2
End With
       End If
   Next picSelected
End If
End Sub