The art for this piece is based heavily on a scene in the extended Steven Universe theme that was shown at SDCC this year. If you haven't seen it yet, I'd check it out, it's awesome! Sorry if this is spoilery, but the one moment where Yellow Diamond turns I think is basically perfect. I definitely felt inspired to try and recapture it!
Also, I will in fact be at Bronycon 2015 in artist alley! I'll post an official journal announcement soon. I will be bringing this as a print!