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']