Several common ways to insert a picture in a latex document

Latex generally only supports the insertion of graphics files in the EPS (encapsulated PostScript) format, so you should try to get the image's EPS file before inserting it into the latex document.

Inserting a picture in a latex document is achieved by using some latex graphics processing macros, and many macro commands support the insertion of an EPS format graphic file in a latex document, mainly:
1. Use the Includegraphics Macro command (GRAPHICX package):

The first step in the document Description section of the latex documentation is to add:

USEPACKAGE{GRAPHICX}

Then refer to the place where you want to insert the picture:

includegraphics[height= height]{picture file name}

Or: includegraphics[width= width]{picture file name}

"Height" and "width" are the heights and widths that you want the picture to print, which must be given in centimeters (cm) or inches (in). The height and width can also be given in the above format, which changes the length and width ratio of the original image. The image file name in the above command refers to the file name of the picture files to be inserted, and the image must be in EPS format.

You can also rotate a picture when you insert it with the Includegraphics Macro command of the GRAPHICX package, by:
includegraphics[height= height][angle= rotation angle]{picture file name}
2. Use the PSFIG Macro command:
The first step in the document Description section of the latex documentation is to add:

Usepackage{psfig}
Then refer to the place where you want to insert the picture:
psfig{figure= picture filename, height= height}
Or: psfig{figure= picture file name, width= width}
"Height" and "width" are the heights and widths that you want the picture to print, which must be given in centimeters (cm) or inches (in). The height and width can also be given in the above format, which changes the length and width ratio of the original image. The image file name in the above command refers to the file name of the picture files to be inserted, and the image must be in EPS format.
3. Use the EPSFIG Macro command:
The Epsfig Macro command is used in exactly the same way as the Psfig: first, you need to add the following in the document Description section of the Latex document:

Usepackage{epsfig}
Then refer to the place where you want to insert the picture:
epsfig{figure= picture filename, height= height}
Or: epsfig{figure= picture file name, width= width}
"Height" and "width" are the heights and widths that you want the picture to print, which must be given in centimeters (cm) or inches (in). The height and width can also be given in the above format, which changes the length and width ratio of the original image. The image file name in the above command refers to the file name of the picture files to be inserted, and the image must be in EPS format.
4. Use the EPSF Macro command:
The use of the EPSF Macro command is: first, the document Description section of the latex document is added:

USEPACKAGE{EPSF}
Then refer to the place where you want to insert the picture:
epsfxsize= width epsffile{picture file name}
Or: epsfysize= height epsffile{picture file name}
"Height" and "width" are the heights and widths that you want the picture to print, which must be given in centimeters (cm) or inches (in). The height and width can also be given in the above format, which changes the length and width ratio of the original image. The image file name in the above command refers to the file name of the picture files to be inserted, and the image must be in EPS format.

from:http://www.binghe.org/2010/03/include-graphics-in-latex/

Several common ways to insert a picture in a latex document