Seems legit, but yeah, target platform blah blah. What are your concerns exactly?
How close is this shield going to be seen? You could probably remove the studs and relegate them to the normal map. But you probably have polys to spare, I'd give a little more more to the silhouette.
I can't really judge the polycount without seeing the edge flow. I get hints of it by looking at the silhouette which is a little chunky and if you have rivets represented with polys you should have the silhouette defined a little better.
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How close is this shield going to be seen? You could probably remove the studs and relegate them to the normal map. But you probably have polys to spare, I'd give a little more more to the silhouette.