What are some alternatives?
GIMP - GIMP is a multiplatform photo manipulation tool.
Microsoft Paint - Paint (formerly Paintbrush) is a simple, ultra-basic graphics painting program that is included...
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Dibuja - Gtk based basic paint program like MSPaint or Paintbrush but for Linux
Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.