I could say Jack's boisterous attitude struck me as close to Rainbow Dash's, but the truth is that Jack's proportions fit very neatly with the way I like drawing Dash. It was also easier to adapt her mane into a hybrid hairstyle that'd let Jack's head tattoos be on display while maintaining Dash's iconic mane colors.
I was kinda dreading having to do all the tattoos, but it was actually her boots that gave me the most challenge when working on this one.
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Robot-Arthropod
My cold robot mind wants an Apple-Jack, but my cold robot heart realizes this was the way to go.