"In C language when you declare [sic] a variable as:
U8 picture[]={...some data...};"

OK, since the root of the original problem is a failure to appreciate the difference between a definition and a declaration, I think now is the time to be pedantic about those terms:

The example given above is a definition - not a declaration:
A Definition is what actually creates executable code, or allocates memory;
A Declaration simply provides information to the compiler about an object - it does not create any executable code, nor allocate any memory. You cannot provide an initialiser in a Declaration.