Nice find, I do recall there were a few different releases of the same game from different companies (Tiger, Orlitronic and Grandstand), which may help when searching for some gameplay videos, the only video I could find for the Tiger version was on one of the ebay listings in my first post and it's very short.
Odd how the box art graphics are quite a bit different to the LCD background image on the actual game.
I suspect the segment image you mentioned is reasonably usable, not very high res but does probably show enough detail for an upscale or redraw? 
http://handheldempire.com/game_instance_images/tn_400x300_2560_2895_1321180390745_Orlitronic_Dragon.jpg
Also found this image of background https://patoe.fr/GAME/Jeux/Orlitronic/Photo/Dragon.htm
and an old expired listing on ebay with some decent box art but non english language text:
https://www.ebay.com.au/itm/326442782334?mkcid=16&mkevt=1&mkrid=705-154756-20017...