Nice work! The dramatic shading is cool.
If I could make some suggestions (though you may have heard these already) - try using references, if you're not already, particularly when it comes to hands, arms, and feet. Your poses look a tad bit awkward in a few panels, and drawing from references rather than from your brain alone will help with that, even if you only do so while practicing sketching and then draw from your imagination for the series.
Also, try flipping the images horizontally on your computer or taking a peek at what they look like in a mirror before they're scanned. It'll help you see mistakes that might have gone unnoticed otherwise, particularly with faces.
Good luck with your series! Looks like it'll be nice and action-packed!
