Whatever your art level, i cannot imagine ANY art being worth $5. Even if it's for "getting your shit out there" Out where? In the realm of underpaying people? Even if you can knock out the drawing there's still the emails, followup etc, which always takes up more time.
For $5 you can't even have someone do some housecleaning for 30 minutes, let alone you doing decent artwork. So you're drawing at a loss.
Use your precious productive time to invest in yourself and your art. That's the post profitable way to spend your time. Your drawings look alright but the major fault is the lack of polish. Cameraphone pictures, lined paper, sloppy finish and visible rough pencils. Without sounding condescending, would you spend money on your own drawings?
Try to build a few pieces, work them until they shine. Good work will come to you when you deserve it. Bad work is always easier to find, but who wants bad work?
I focused on building a portfolio for years before work finally started coming in. And once it started i've just been bouncing from job to job. Now i can happily say i'm not even picking up a pencil for assignments under $300.
Also, corporate clients > commissions. There's more of everything: professionalism, directness, clarity, vision, and most importantly, budget.