\documentclass[10pt]{article}
\usepackage[spanish]{babel}
\usepackage{graphicx}
\graphicspath{{C:/Users/Raul/Desktop/Universidad/SEGUNDO/MECÁNICA CLÁSICA I/Práctica 1/informe/images}}
\begin{document}
\includegraphics{sd}
\end{document}
I'm new in LaTeX but I think the code is correct. However I have the problem mentioned in the title. Regards
MECÁNICA CLÁSICA Ineeds to be enclosed in double quotes--similarlyPráctica 1also should be "Práctica 1" not just Práctica 1 – js bibra Nov 23 '19 at 04:30\includegraphics{sd}? where is the image file relative to your main document? – David Carlisle Nov 23 '19 at 14:39