Paste Picture From PictureBox/Clipboard to Rich Text Box
When you will press the button,  the picture 
box's picture will be copied to the clipboard,  and from there will be 
pasted to the rich text box.
Preparations
 Add 1 Command 
Button (named Command1), 1 Rich Text Box (named RichTextBox1) and 1 Picture Box 
(named Picture1) to your form.
    Add    a picture to the Picture 
Box.
Module Code
Declare Function 
SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, _
  
          ByVal wMsg 
As Long, ByVal wParam As Long, lParam As Any) As Long
Public Const WM_PASTE = 
&H302
Form Code
Private 
Sub Command1_Click()
'the 2 code lines 
below copy the picture box's picture to the clipboard. if you will omit 
them, 
      
           'the 
picture that currently found in the clipboard will be copied to the rich text 
box.
    Clipboard.Clear
    
Clipboard.SetData Picture1.Picture
    SendMessage 
RichTextBox1.hwnd, WM_PASTE, 0, 0
End Sub