I tried your code but I got an error. No idea of what is happening. Thanks.

 

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! terminal: >> picture
! Isolated expression.
<to be read again>
                   ;
<*> ...3u yscaled 60.09u shifted (69.85u,20.30u) ;
                                                   ;

.

system          > tex > error on line 17 in file kk.tex: terminal: >> picture
! Isolated expression.
<to be read again>
                   ;
<*> ...3u yscaled 60.09u shifted (69.85u,20.30u) ;
                                                   ;

 ...

 7     numeric u;
 8     u:=1;
 9     textX:=87.51u;
10     textY:=96.31u;
11     pic:=thelabel.urt(btex {Test} etex scaled 1.00,(0,0));
12     draw pic shifted (textX, textY);
13     externalfigure "mill.png" xscaled 80.13u yscaled 60.09u shifted
14     (69.85u,20.30u) ;
15     \stopuseMPgraphic
16    
17 >>  \useMPgraphic{gh}
18    
19     \stoptext
20    

<inserted text> ...re.mp ; fi ; ;;;;]===], false)}
                                                 
\processMPgraphic ...e ;\!!es , \MPaskedfigure )}}
                                                  \egroup \placeMPgraphic \d...
\handleuseMPgraphic ...hics \processMPgraphic {#3}
                                                  \endgroup
\douseMPgraphic ...{\@@MPG \currentMPgraphicname }
                                                  \empty \endMPgraphicgroup
<to be read again>
                   
l.17 \useMPgraphic{gh}