On your Front Panel, put a picture indicator found in Controls Palette - Graph - Controls - Picture. If it comes up as a control, change it to an indicator. On your block diagram, wire the jpeg file's path to the Read JPEG File vi (found in Graphics & Sounds - Graphics Formats - Read JPEG File.vi). Wire the image data output to Draw Flattened Pixmap input (found in Graphics & Sounds - Picture Functions - Draw Flattened Pixmap.vi). Wire this output to the picture indicator.
If you just want to display a constant picture on your Front Panel, just drag the picture file onto the Front Panel.