inkscape --export-pdf=Symbol_thumbs_up.pdf Symbol_thumbs_up.svg

pdfcrop Symbol_thumbs_up.pdf

pdftops -eps Symbols_thumbs_up-crop.pdf Symbols_thumbs_up.eps

documentclass{article}
usepackage{graphicx}

newcommand*{RightThumbsUpAux}[1]{%
  begingroup
    sbox0{Ag}%
    raisebox{-dp0}{%
      includegraphics[{%
        height=dimexprdp0+ht0relax,
        #1%
      }]{Symbol_thumbs_up-crop.pdf}%
    }%
  endgroup
}
newcommand*{RightThumbsUp}{%
  RightThumbsUpAux{}%
}
newcommand*{RightThumbsDown}{%
  RightThumbsUpAux{origin=c,angle=180}%
}
newcommand*{LeftThumbsUp}{%
  scalebox{-1}[1]{RightThumbsUp}%
}
newcommand*{LeftThumbsDown}{%
  scalebox{-1}[1]{RightThumbsDown}%
}

begin{document}
begin{tabular}{ll}
  LeftThumbsUp    & verb|LeftThumbsUp|\
  RightThumbsUp   & verb|RightThumbsUp|\
  LeftThumbsDown  & verb|LeftThumbsDown|\
  RightThumbsDown & verb|RightThumbsDown|
end{tabular}
end{document}

documentclass{article}

usepackage[]{graphicx}
usepackage{scalerel}
defthumbsup{scalerel*{includegraphics{up.png}}{O}}
defthumbsdown{scalerel*{includegraphics{down.png}}{g}}

begin{document}
thumbs up thumbsup

thumbs down thumbsdown
end{document}

documentclass{article}

usepackage{fontawesome}

begin{document}Huge

faThumbsDown

faThumbsODown

faThumbsOUp

faThumbsUp

end{document}