One recommendation about the composition: it's very rare that composition will work if you hide all focus points near canvas boundaries and keep center of the image empty. Your character is cool, you can move her closer to the thirds, and make a conquistador smaller (in the distance). Right now this is two "stains" of almost the same size. Your progress is fascinating, so I just wanna help you to avoid some mistakes
Really cool design! Only thing that hits me and takes me out of the image is how she's holding the gun. Her right hand would be really uncomfortable to hold a gun like that and if she's just shot the gun her trigger finger is no where near the trigger. I would maybe consider bringing her right had up so she's holding the gun on the wood and have a bend in her elbow. I would also have her left hand holding the gun as it currently looks like its floating above it not in contact with the gun at all. Great dynamic pose and comp for the image otherwise and some bold colours, be great to see if develop.