1) Which Picture of stella do you need? Can you be a bit more detailed?
2) Go to the Woods near Red Fountain. On a tree to the left you will find a black Dildo that you can give to her by spying her on the backstage
3) Find Tecna where? First time you meet her is talking with Stella at Mokka's, then you will be able to call her to play some virtual games at ur apartment