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Sweet bots. Is that some Warframe I'm seeing in between there? You should do more of those, love that bio-mecha aesthetic.
Don't know if you're up for some unsolicited advice but... don't be afraid of blocking in blacks and establishing a establishing a shadow border, especially in mecha. Often a single block of black is worth considering when doing those deep shadows like in between plates of armor or on the other side of a lightsource etc. Beats having to do a billion lines of hatching when a stroke of black can achieve the same result, and theres still midtones to worry about. It also helps establish a greater sense of depth and atmosphere in the image.
Also, take care of not leaving patches of white between shadows (like on the 9th pic), gotta keep a consistent depth with those shadows man. Get a pen brush for shadows and lineweights; works good and feels great to work with once you get familiar with it. Helps to get those solid black lines out like a professional and sometimes I like to pretend that I am one.
Have you tried prismacolors or copic markers to color? I picked an off-brand set of 20ish colors a few months ago for ~$50 and it's been a pretty good investment. I don't do traditional or colors as much though.
Also, I've been absent from this forum for a good 4 years and it's good to be back and see some old names still active. Here's some stuff I did, dumb sketches and stuff.
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Nah man, always happy to recieve feedback
I actually have a brush pen (did use it in no 9 there) but I'm still struggling with massive blocks of value since I feel I don't have as much control there, whereas hatching allows gradation. Still, mostly an issue of confidence and lack of practice with consolidating shapes and values for better read.
Also I've not had the chance to try Copics, but I'd love to since they look really fun and versatile. That last image was a combination of four rather different things, a G-tec pen for black, a ball-point for blue, a fine-liner for red and a random highlighter for yellow X) Work with what you've got I guess.