Here's a little bash shell script which overlays some text onto a resized
image:

#!/bin/sh

convert $1 -resize 101x80\> -size 101x80 xc:black +swap \
 -gravity center -composite \
 -fill red -stroke white  -font Comic-Sans-MS-Regular \
 -pointsize 16 -gravity south -annotate 0 $2 rgb:'-' | \
 stream  -size 101x80 rgb:'-' -storage-type char -map rgb '-' | \
 ./a60-lcd


Just run this with two arguments: the image and the message.
/a60-display.sh /usr/share/pixmaps/faces/penguin.jpg Meh


.. will display ... [see file '04-example.jpeg']