Generally speaking, not that I don't appreciate the critique, my overall style is completely freehanded and a sans-ruling method of lining things up. Basically, I just eyeballed the whole thing as I was working on it front-to-back (perspective (foreground to background) and starting at the front of the ship to keep the entire drawing on the page. Not fun when you accidentally overshoot your scaling, like I almost did with it's predecessor, and a few other drawings.), and making sure I was keeping things in-line as best I could going one-shot with it. Plus, I try to get it done in a single session if possible, with a maximum time of 3-4 hours per sketch.
Basically, just as well, I'm not a fan of drawing it, re-drawing it, and then re-drawing it again to get a final (ironically, being a designer, this is in good practice. Still not a fan of it whatsoever.). I'm not a fan of thumbnailing and then roughing it, and then retouching it, and THEN making it final... only to retouch it again and again. Sniper-policy, first shot is final shot, no exceptions. It's just how I draw, since high school (I took classes to learn proper methods; but still prefer my method, just to keep it fun. Otherwise, it just feels like work, and I lose motivation to draw overall. As you can already tell, I hate working, and am lazy as ever.). Keeps the idea fresh, and the image as clean as possible with as minimal sketchiness as I can get (figure drawing is an exception, however, because I suck at drawing people and creatures). Looking at my other pictures that I rendered like that as well, overall, if anything, I tend to illustrate more isometrically, than with complete vanishing points. Makes it feel like a technical blueprint, in a sense, rather than an illustration. Of course, the common side-effect of my illustration style is like you pointed out, more divergence than convergence. There's just so many details to keep attention to at the same time, even with looking back and forth as I draw to make sure I have consistency; one-shotting it overall, I'm amazed I can still line things up as well as I can without using rulers and the like, and using the opposite sides as a form of reference. The main divergence is because I have to rebuild one side for the other in the opposite direction. I tried going at it differently by making a sort of outline first for the leading edge; but even so, it's tricky getting the angles just right sans-ruler and the like (like I said, it's just my style of approach).
Looking at my sketching method and application style; I feel like I have a Bob Ross angle of making quick, yet decent works of art. My landscapes feature plenty of happy little trees (like on the floating island image I posted some time ago).
With most things I make, it's more about the idea being made, rather than how it's rendered or in some cases, used. It can look like total shit, but as long as my idea is illustrated, I can always adapt it to other media (like those half-finished/half-assed 3D renders I posted). The drawing's just to get it made, so I can also apply it to other things on a whim (like making one of these craft for MS Flight Simulator; also so I can interact with my own art via in a game (Garry's Mod or Minecraft also qualifies)), when I get another artistic impulse again. But mostly, I'm just doing this for fun. Not like I'm intent on making any money off of any of these things anyway. No real point in it anyhow; there's no such thing as an original idea, and people can sue for damn near any reason, because they don't have enough money already (Sharing is NOT caring, apparently). I mean, the (multi-meta-exo-intra-)universe most of my art is involved in is a copyright and trademark nightmare (you know, like any creative person or child's imagination usually is on a daily basis. May as well sue babies at this rate for thinking cars are edible, because Godzilla.). It's a melting pot of every series combined, because they're cool, and this is the evolved end-result; like these ideas climbed out of that primordial soup or evolved from those as a base framework. Look deep enough, there's a reason to sue for anything, including artistic license with approach to scientific crap (like Stargate, for starters, and the ability to make survivable event horizons go from point A to point Z, and cutting out the middle men because *magic/science*. Even the makers of Ancient Aliens, be any of it fact or fiction (mostly the fiction part), can sue my ass because I have an avian race that happens to be in cahoots with ancient Egypt; except they fly ships that looks like swords and such.). In an odd sense, I feel like eventually, even non-profit artwork/artists like this/me can eventually be sued for profit by anyone "major", for no actual reason at all *cough*moneymoneymoney*cough*.
Pardon that rant, but I felt it needed to be said. What happened to art for fun? Why must everything be serious business? Everyone hates each other enough already. We don't need any more fuel added to this fire; but of course, such words would always fall on deaf ears.