Who can I commission for title art?

So as I mentioned in my last blog I'm starting up a few other MLP projects, one of which has two chapters almost ready for posting, the other is now one chapter in (Scaleless' 28th chapter is also just about done, I just need a second opinion on whether it's decent or if I need to cut some of the drag off). Unfortunately I'm getting a bit stuck in finding decent pictures to pair with these so I'd like to know a good source for custom art.

One pic will feature Octavia and Vinyl Scratch on a beach. The second will need to be a pic of Chrysalis in a submissive position before Shining Armor and Cadence (not clop worthy, just that she's literally begging them for aid). I might as well also see about getting another pic of Seath and Twilight while I'm at it, just cause I thrive on being original in some manner, however minor.

Any suggestions or offers would be welcome!