Re: Missing CGs and scenes
If you're missing Crayanne's second scene, complete the twins' quest line.
If you already have it, then it may be from her training scene before the final boss battle (any route).
Other scenes in Wil's tab are gothic costumes scene (craft, upgrade and equip all 3 costumes and visit the workshop) and Jane's scene (beat all normal, special and elemental arena battles as well as Wil's gauntlet).