[the_other_guy]

they can be added by adding image tags in Variables.xml

xml:
<variable name="PlayerbannerVar">

  <value condition="!String.IsEmpty(Player.Art(banner))">$INFO[Player.Art(banner)]</value>

  <value condition="!String.isempty(Player.Art(fanart))">$INFO[Player.Art(fanart)]</value>

</variable>

<variable name="PlayerthumbVar">

  <value condition="!String.IsEmpty(Player.Art(thumb))">$INFO[Player.Art(thumb)]</value>

  <value condition="!String.isempty(Player.Art(fanart))">$INFO[Player.Art(fanart)]</value>

</variable>

<texture>$VAR[BannerArtVar]</texture>
<texture>$VAR[clearartVar]</texture>
<texture>$INFO[ListItem.Art(clearlogo)]</texture>
https://forum.kodi.tv/showthread.php?tid=341988
then using the tags to place images