Hmm not tested but should work, adds picture after player name 
open dxscoreboard_client.lua and go to line 701 
make one free line there and add 
 
dxDrawImage( xPos,  y+s(1), 15, 10, "picture.png", 180, 0, 0, cWhite, drawOverGUI ) 
 
will look like 
 
xPos = xPos + textLength 
end 
dxDrawImage( xPos,  y+s(1), 15, 10, "picture.png", 180, 0, 0, cWhite, drawOverGUI ) 
else