Hi Brian, like Jim one of the first things I wanted to mention was the seam lines - the one running down the back of the right arm is especially obvious because of the way it catches the light. Incidentally that's a good way of finding them, even very fine ones you really can't feel you'll can usually see if you rotate the part under a desk lamp; even if a seam is very slight you need to give it some attention, the painting process will not hide one in fact it makes them easier to spot! Some modellers will give a model an undercoat and use the matt surface to look for flaws they missed 'in the metal' as the reflective surface can make it hard to spot some things - I imagine everyone here has missed something during the prep stage and only spotted it during or after painting.
We all have our own ways of dealing with seams using craft blades, files, abrasive papers and various attachments for craft drills (Dremels etc.) including my favourite, rubber 'polishers' of various shapes, that are very good for larger surfaces and/or worse problems in soft materials like white metal and resin; you need to try a few things and see what works best for you. I use all of the above.
The right arm/shoulder join also needs attention as there is an evident gap visible in the fourth photo. If the fit of the parts was bad (not that uncommon, even with some well-known brands) you'd need to fill this area with putty. Most of us use one of the two-part sculpting putties for this kind of thing these days - MagicSculp, Apoxie Sculpt, Kneadatite (Duro), Milliput or A+B.
On the painting, as Jim has said you really need to work on the amount of paint on the surface - you want to aim for being unable to see any brushmarks at this sort of enlargement. Paint slower, use less paint, softer brushes and preferring opaque colours (and better brands) will all help here. A nice smooth acrylic or enamel undercoat in a colour close to the finished colour you're looking should help reduce the amount of oil paint you need to apply, although some oil painters work directly on primer so this is something to work on for yourself and see what suits.
On the highlighting and shadowing generally, a lot of people have trouble deciding on where and how much to shade and highlight, a common mistake being to highlight the edges of creases instead of their upper surfaces. A number of painters developed ideas about how to highlight and shade in a more regulated manner and these are probably best described by Shep Paine's 'stop-sign rule', once you learn it you won't have to worry about how to tackle certain areas (there are tricky exceptions but they're relatively rare). The zenithal/overhead lighting idea from the Continent is basically the same idea.
Overall the fleshtones look pretty good but it looks like there is a colour cast in the photos so I'm not sure I'm judging them as well as I could. Watch out for shadow mixes contaminating areas you don't want them in during blending.
I agree with Jim on the metallics - on the right path. The heavily-oxidised appearance you see in a film like Troy and in some models is very unlikely so a degree of shine is almost always going to be appropriate. The reinforcing bands around the edge of the scutum would probably have been made of bronze or brass too by the way.
Metallic paints are a difficult area to master and take some work, most of us have experimented with numerous types looking for the best/our favourites. There are a number of options for white metal paints that give good results but for yellow metals since you're an oil painter already I think that printers' inks are probably your best bet. In addition to giving excellent results (perhaps the best you can get) you're already used to something like their working nature already (oil-based, diluted with spirits) and some need a small addition of a medium like linseed oil, stand oil or Liquin which you might already have.
Hope that helps.
Einion