Black brush - Problem with a black brush is they often leach black colour onto the work, hence the natural, non black comment.
Bigger rag would definitely help.
Don't think I'd be using 50/50 especially on what looks to be cedar as it will end up highlighting the pores in the timber and giving too much shine. in the wrong placed. For something like the Green Man (a completely different kettle of fish to the ebony masks) you want to get a buffed sheen rather than an over-all shine. The buffed sheen will be slightly dull in the lowlights and have a silky glow in the highlights this will accentuate the form and make it stand out beautifully, bringing more depth and definition to the carving. An overall gloss will often detract from the carved work and won't look as nice.
Unfortunately cedar isn't the best or easiest to get a waxed or shellac and wax finish on without actually filling the grain. However with the Green Man I would leave the pores unfilled and just give it a coat 10-1, fine sand with 1200 grit and maybe a second 10-1 or an 8-1 then again sand lightly with 1200 grit making sure to turn the abrasive continually so you are sanding with clean new grit and not clogged or worn grit.
There are a couple of ways to go from here but I think your best bet would be number 1 below:
NUMBER 1: Following on from the final sanding I would use the Trad applied sparingly with a soft tooth brush into all the nooks and crannied then buff with a big soft rag as described. Or with the not black boot brush followed by the soft cloth to give the final buff and hit the highlights. The boot brush will be moving polish all over the work rather than buffing it to a glow, hence the final buff with the cloth.
You can apply a few coats of the Trad over a few days to bring up a brighter finish if desired.
Applying the wax sparingly and more often is easier and better than applying too much wax in one hit which is just a waste of time and gives you lots, lots, more work trying to buff it up.
Number 2: Following on from the sanding with 1200 grit. Apply a number of 50/50 coats with a really good brush (Artists Watercolour Mop as per previous post) sanding lightly between coats wit 800 grit, until the grain was filled. You could use a small amount of pure Talc to aid in the filling and make sanding easier but only in the first couple of coats. Once the grain is filled and the surface is silky smooth to the touch use EEE-Ultra Shine as a final cut and polish to bring up the shine, buff well then apply Trad as described above. Buffed well with clean soft cloth.
This will give the whole thing the amazing look and feel more you would expect to find on a highly french polished piece of furniture, or something akin to wooden look porcelain.
Number 3: Continuing on from above the whole thing can be rubbed over with Tripoli powder to bring it back to more of a glow rather than a gloss.
Number 4: There are many more things you can do to a Green Man but I think I've given you 2 more than you need already so this'll do for this one.
A NOTE ON WAX: If you put a match head of wax on a piece of glass say 50mm dia spread it out and wait for it to dry then buff it. You will get the exact same result as if you put a thumbnail size piece of wag into the same size glass, only it will take a lot longer for the larger amount to dry and will be a lot harder to buff and polish up to give the same result.
Hope this is of some more help Terry
:U