Don't be shy. I only joined recently, but I've found the people here to be very friendly. I have yet to see a judgmental comment. I'm sure we'd all love to see whatever you are willing to show.
As for putting up a profile pic, if you go to your profile page, you should see a little white box on the lower left of the circle where your picture goes. (It probably just has your initials there now.) If you click on that while box, the prompts should guide you through the process. Feel free to message, if you're having trouble.