Rin and Satsujinki standing back to back a little like in this picture:
Satsujinkis eyes are fully bandaged. Use white bandages, not the red ones please. He'd hold his knife just like in the picture and his back would be pressed against Rins. His outfit would be complicated though. A black jacket, no zippers, one white cross on the end of each sleeve. The jacket would be open, underneath a white shirt or whatever looks good, up to you. Black pants or Jeans, although I am not sure if jeans would fit with the rest of the outfit. Shoes are up to you. The idea was that he would basically wear some protective clothing provided by the church, so if you have another idea that gives off that vibe without making him look full Archer-levels of over the top then it would be appreciated. Let his facial expression be "serious business".
Rin would stand with her back pressed against Satsujinkis, and you may call me Captain Obvious from this point onwards. She would hold her right hand close to her face just like you think it would look good, holding Jewels between her knuckles. On her hand would be a command seal looking just like her current one with a minor edit.
This is how her current one looks. I want the line to be looking like Shikis knife (a little resemblance of shape, no details, althoug details would be impossible to draw on there anyway), facing down on the circles. Her outfit would be either the coat outfit of the beginning of F/SN or her standard outfit. Give her a little smirk of confidence as expression