Edward Hopper, Rooms by the Sea, I think. I love him, but think his paintings are often more gloomy than hopeful, this one feels extremely hopeful though - the open door, the light coming in...
A cute drawing by illustrator Mark Johns
Hope for some comes in a bottle. I probably would never have included this in a post about hope if it weren't for my recent medical escapades.
Slightly clichéd it may be, but this one had to go in.
Pandora's Box by Andrew Junge
A song for hope. I cannot for the life of me find the original and brilliant version by Sam Cooke (apparently written by him in response to hearing Bob Dylan's The answer is blowing in the wind, in the midst of the Civil Rights Movement in the states) - nor can I embed the video for some reason, but here's a link to the Al Green version.
p.s. I just remembered that Nadia means hope in Russian, how nice :-)