Picnick is an online tool that will help you in photo editing, making them much more showy, appealing and interesting; you just need to try and create the perfect combination to make an authentic artwork.
You can edit them from a basic way (white and black, sepia, negative, raised), to a more complex (pencil drawing (sketch), cinemascope, Orton effect, tint, heatmap, etc), write in the photo, add stickers or adhesive labels, apply frames, etc, since its advanced software will allow you to edit photos with amazing effects.
It can correct red eyes, or realize an auto correction, if the picture is too dark or too light. It also offers Premium effects, or to people that want to pay for that service, to acquire, obviously, greater number of effects and benefits. Visit their website:
http://www.picknick.com/