Change a few things in the Macro

I have included a Macro script below and seek assistance in modifying it. Specifically, I aim to enlarge the size of the text box, as depicted in the accompanying image. Presently (in the below script), the text box dimensions allow for only a single row of text, which proves insufficient. Additionally, I would like to automate the addition of descriptive text beneath each inserted picture. Ideally, the script should automatically append labels such as "Picture 1," "Picture 2," and so forth below the respective images. Currently, the script associates the picture name and positions it beneath the image.

Looking forward to recieve help in getting this sorted for us. This will make our work so much easier and we would save lots of time. 

Sub AddPics()
Application.ScreenUpdating = False
Dim i As Long, j As Long, c As Long, r As Long, NumCols As Long, iShp As InlineShape
Dim oTbl As Table, TblWdth As Single, StrTxt As String, RwHght As Single, ColWdth As Single
On Error GoTo ErrExit
NumCols = CLng(InputBox("How Many Columns per Row?"))
RwHght = CentimetersToPoints(CSng(InputBox("What max height for the pictures, in Centimeters (e.g. 5)?")))
On Error GoTo 0
'Select and insert the Pics
With Application.FileDialog(msoFileDialogFilePicker)
.Title = "Select image files and click OK"
.Filters.Add "Images", "*.gif; *.jpg; *.jpeg; *.bmp; *.tif; *.png"
.FilterIndex = 2
If .Show = -1 Then
'Create a paragraph Style with 0 space before/after & centre-aligned
On Error Resume Next
With ActiveDocument
.Styles.Add Name:="TblPic", Type:=wdStyleTypeParagraph
On Error GoTo 0
With .Styles("TblPic").ParagraphFormat
.Alignment = wdAlignParagraphCenter
.KeepWithNext = True
.SpaceAfter = 0
.SpaceBefore = 0
End With
End With
'Add a 2-row by NumCols-column table to take the images
Set oTbl = Selection.Tables.Add(Range:=Selection.Range, NumRows:=2, NumColumns:=NumCols)
With ActiveDocument.PageSetup
TblWdth = .PageWidth - .LeftMargin - .RightMargin - .Gutter
ColWdth = TblWdth / NumCols
End With
With oTbl
.AutoFitBehavior (wdAutoFitFixed)
.TopPadding = 0
.BottomPadding = 0
.LeftPadding = 0
.RightPadding = 0
.Spacing = 0
.Columns.Width = ColWdth
.Borders.Enable = True
End With
CaptionLabels.Add Name:="Picture"
For i = 1 To .SelectedItems.Count Step NumCols
r = ((i - 1) / NumCols + 1) * 2 - 1
'Format the rows
Call FormatRows(oTbl, r, RwHght)
For c = 1 To NumCols
j = j + 1
'Insert the Picture
Set iShp = ActiveDocument.InlineShapes.AddPicture( _
FileName:=.SelectedItems(j), LinkToFile:=False, _
SaveWithDocument:=True, Range:=oTbl.Cell(r, c).Range)
With iShp
.LockAspectRatio = True
If (.Width < ColWdth) And (.Height < RwHght) Then
.Width = ColWdth
If .Height > RwHght Then .Height = RwHght
End If
End With
'Get the Image name for the Caption
StrTxt = Split(Split(.SelectedItems(j), "\")(UBound(Split(.SelectedItems(j), "\"))), ".")(0)
'Insert the Caption on the row below the picture
oTbl.Cell(r + 1, c).Range.Text = StrTxt
'Exit when we're done
If j = .SelectedItems.Count Then Exit For
Next
'Add extra rows as needed
If j < .SelectedItems.Count Then
oTbl.Rows.Add
oTbl.Rows.Add
End If
Next
Else
End If
End With
ErrExit:
Application.ScreenUpdating = True
End Sub

Sub FormatRows(oTbl As Table, x As Long, Hght As Single)
With oTbl
With .Rows(x)
.Height = Hght
.HeightRule = wdRowHeightExactly
.Range.Style = "TblPic"
.Cells.VerticalAlignment = wdCellAlignVerticalCenter
End With
With .Rows(x + 1)
.Height = CentimetersToPoints(1#)
.HeightRule = wdRowHeightExactly
.Range.Style = "Normal"
End With
End With
End Sub