Mechanical bits seem to confound most newcomers to putty. The trick to them is to machine (cut, file, and sand) the main parts in stages, and then sculpt the final details on top. So for example on your binoculars I would sculpt a basic body shape, let it cure, then sand and file it into shape. I would then drill two holes into the body and putty in some brass rod or tubing. Once that was cured i would file the brass tubing ends flat. Finally, I would putty on the eye rings and other surface details. Mechanical bits typically aren't very hard to sculpt, but they're a pain because they usually take quite a few stages of sculpting / sanding to finish. As a side note, it will also help to sculpt the parts you plan to sand and file out of a harder putty like brownstuff, aves, or milliput gray. Greenstuff will work, it's just not quite as easy to machine as the other putties.
For the boots and laces there are a couple tricks I can share with you.
[This part about the boot soles is from a question I previously answered. I was just too lazy to rewrite it ;-)]
The boot soles are fairly easy, but I think an illustrated diagram is in order;

This is a Left Foot. I start by sculpting the basic foot shape. I don't worry about adding extra for the heel or sole, all that comes later. Once I have my basic shape then I can start adding the sole, heel, and wrinkles.
I use a special wax minarette # 1709S from sculpt.com to add the sole lines, however any thin sharp blade will work like an xacto or a scalpel. I start at the back of the boot at the height of the heel I want (#1) and very gently press in a line. Then I work my way around the heel until I get to #2 where I angle the line down to the level of the sole. Then I continue the line around the toe of the boot #3, #4, and #5 on the opposite side, go back up with #6 on the other side as well and then finish by connecting #6 and #1. Once I have my sole/heel line in I use a needle and poke in a hole at #7 and #8 to make it look like a heel. I then shape the #7/#8 holes to a triangular cutout that really sells the boot heel. At this point I go back and start smoothing out the heel and the sole with a very tiny spoon tool I made using music wire. Here's a great tutorial on how to do that,
http://sculptingtools.blogspot.com/ I use one similar to the one on page 29 only it's rounded on top and it's VERY small (.6mm music wire). To make that small of a bend in music wire you don't need to heat it like it says in the tutorial, you can just gently bend it with pliers after you hammer it out flat. Sorry to get off track with the tools, I'm a tool junkie. Anyway, after I smooth out the heel and sole I finish the boot by adding the wrinkles. A couple above the heel, a couple where the toes flex, and a couple where the ankle flexes and I have a boot.
For the laces I would actually cut all those in with a scalpel. I would cut the two lines where the tongue of the boot would be. Next I would poke holes for the eyelets and then cut in the TOP laces all going from left to right (or right to left, whichever you prefer) then finally I would cut in the laces on the BOTTOM going the opposite direction. It sounds harder than it really is. Let me know of you need more specifics on that particular technique.
On another side note, GREAT rule of thumb on knowing when to cut a detail in as opposed to adding it on is if you want the detail to really stand out then you add it, if you want the detail to "blend in" you cut it in. In the boot lace example you don't want your laces to to stand out so you'd cut them in.
One last thing. I notice your putty seems to be getting a little brown. I'm assuming you're baking it to speed curing? If so, you'll want to turn the temp down a little bit because when putty turns brown like that it's actually scorching. When putty gets scorched it sort of "foams up" inside and that can have very unpleasant consequences when sending it to the moldmaker.
Hope that helps and keep up the Great Work!! :-D
Gene