change long row to blob

I plan to change the datatype from long raw to blob as from tables stud_photo and cimpant _image below. But i am not sure if it is a good idea. pls advise.
TQ!

SQL> DESC STUD_PHOTO;

 Name                            Null?    Type


 ------------------------------- -------- ----

 STUD_ID                         NOT NULL VARCHAR2(15)
 STUD_PHOTO                               LONG RAW
 STUD_UPD_BRANCH                          VARCHAR2(1)
 STUD_DATETIME                            DATE

SQL> DESC CONPANY_IMAGE;
 Name                            Null?    Type


 ------------------------------- -------- ----

 IMAGE_ID                        NOT NULL VARCHAR2(10)
 IMAGE                                    LONG RAW