Sharkbite fitting connection is leaking around painted pipe
It looks like the paint on the pipe is causing your problems. I'd recommend shutting off the water, removing the shark bite connector, and stripping the paint for a couple inches on either side. The hardware store will have chemicals to help strip the paint so you don't have to do it all manually. 

Here is a video of how to use emery cloth to clean a copper pipe. The video is a bit long for the topic but covers it well: https://www.youtube.com/watch?v=Q4LvzHt4m3M

When you reinsert it, SharkBite recommends 15/16" insertion depth for 1/2" pipe.
 Typically you should measure that distance from the end of the pipe and mark it with a permanent marker so you have a sight line for reference when pushing the fitting on.