This course contains a little bit of everything with modeling, UVing, texturing and dynamics in Maya, as well as compositing multilayered EXR's in Photoshop.
The attachment you included of what looks like an ARVN helmet does indeed have that curve at the bottom.
In the end, your render look nice, to improve it, do make the changes suggested, I like the grenade.
I don't know why, but I thought I'd crank out a polygon helmet. I did it in under an hour (textures included). It's a WWI British pattern (1915) helmet (the famous "Tommy/Doughboy" helmet which was worn by the British through WWII and by the US until the "steel pot" replaced it in 1942).
I wasn't going for photorealism and I did it from memory rather than a photo (though I suppose I could have used one). "Close enough for government work", and again done in well under an hour. Lighting (or attempting to light it) took a good chunk of that hour! :-)
Basically, it was a half-sphere with extruded edges.
Anyway, the advice about using a bump map is relevant. I created a grayscale noise pattern in Photoshop and applied it as a bump map to simulate the gritty finish on many of these helmets. Also, be sure and bevel all sharp edges!
Some nice helmet work on this thread, keep it coming!
you should be able to just... make a noise texture in maya for the bump node, but if you decide that you actually want to make a noice texture in photoshop, then all you gotta do is create a new document, then apply a noise filter... the nice thing about doing it in maya, though, is that you can change the settings in the program and tweak as you like instead of having to jump back and forth between programs just to tweak settings to get things looking the way you want it to look.
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