Retrieve one picture file

Hi,
Why do I get these below

Copy direction must be either 'in', 'out' or 'format'.
usage: bcp {dbtable | query} {in | out | queryout | format} datafile
  [-m maxerrors]            [-f formatfile]          [-e errfile]
  [-F firstrow]             [-L lastrow]             [-b batchsize]
  [-n native type]          [-c character type]      [-w wide character type]
  [-N keep non-text native] [-V file format version] [-q quoted identifier]
  [-C code page specifier]  [-t field terminator]    [-r row terminator]
  [-i inputfile]            [-o outfile]             [-a packetsize]
  [-S server name]          [-U username]            [-P password]
  [-T trusted connection]   [-v version]             [-R regional enable]
  [-k keep null values]     [-E keep identity values]
  [-h "load hints"]         [-x generate xml format file]
NULL

when trying to retrieve one picture file from the DB?

declare @bcpCommand varchar(500)
SET @bcpCommand = 'bcp "SELECT photo_file FROM user_master WHERE user_ID = 1" -T -c'
EXEC master..xp_cmdshell @bcpCommand

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Many Thanks & Best Regards, Hua Min