Are you sure that camera is the right folder ?
Photos are stored in /home/user/MyDocs/DCIM
so it is accessible by doing cd MyDocs/DCIM
For avoid error and save time, you can do Tab or ctrl-i for autocomplete in Terminal, note also that for use file or directory with some special characters (such as (); or even space), you need to add a backslash (\) before the special characters
"My photo" will become in terminal "My\ photo" in terminal (don't forget maj too, unix is case-sensitive)