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#11
If that's what you want to do, that'll work too. You can also use a partition on the same drive and have the folders there. The one advantage about having certain files and folders on a separate drive or partition is that maintenance to the main (C) drive won't affect the other drives. That is when you erase, or do a clean install on the OS drive, the files and folders on the other drives or partitions aren't deleted.
On the other hand if your main drive is faster than your other drives, you could simply leave your pictures since they would open faster. This is one reason to leave them on the default drive/folder.
There are lots of reasons why you might do one over the other it just comes down to what's easier and more convenient to you and how you use your system.