It is technically stunning as usual!
I really like what you did with the neck and wings, as well as the greebling!
My crits are more on the "big shapes" and design side of things. Some proportions look off: someone pointed that the main engines look too tall, and I can definetly see that.
Also, the Apollo has this look about it, where each individual parts seem to "blend" into each other, whereas this htl design feels more like each part looks tacked on to the next. It is more prominent on the main engines: in the original, they look like a single piece (with a cool looking triangular shape in the middle - red lines on the image I've attached), but on your design they definetly are 2 different parts. Same reasoning goes for the underside (main interesting shapes signaled in blue).
Also, the lack of harsher lines. I know that part of your style lies in having many chamfered and smooth edges, as well as sweeping curves. So far on this Apollo it is working allright in all honesty. However, I think that it isn't really working on those holes in the engines (where you'll model some machinery). The original lozenge shape looks far more interesting and doesn't break the "visual read" of the design.
This one is a nitpick: I traced in green an interesting shape the original implies to my eyes. You somewhat have that in your version, but I think it would gain a lot if you really make it look like there's a division there.
Another nitpick is the gun pods. Right now they look like a smooth edged box. I think the shape could be more interesting (maybe lozange?).
Finally, the cockpit. It has been mentioned before, so I'll keep it short: I really find the original head and cockpit very appealing!
EDIT: These might sound like "purist" comments. They're not, it's just that I'm very fond of the Apollo.
[attachment deleted by a basterd]
