I have 1 session left to finish my new piece. I would like to combine with my previous tattoo to complete an upper arm sleeve.

What do you guys think would look good to fill this space. Looking for any and all ideas. The only thing I’ve found so far that sparked my interest was like a gothic/cathedral window. What ideas do you guys have?

1st tattoo on inner bicep is 10 years old. New guardian angel still has 1 more session. Looking for ideas to help combine the 2 and finish this upper sleeve.

I kind of like the idea of like a gothic cathedral glass. What ideas do you guys help that would really help tie these together?