Just storing your images in a subdirectory of bin may not include them in the published build.
Images can be added as ressources:
1. Open Project Explorer
2. Right-click on your project and chose "Properties"
A TabControl with tabs on the left side opens.
3. Chose "Ressources"
A Tab opens.
4. In the tab's button row, select "Images".
5. Add images.
The images you select as ressources will get compiled into your assembly. You can use them in your program via
Properties.Ressources.[RessourceName]