Ah! you made my favorite! cool. but doesn't reach my render expectation. Well, for me, it looks like a HG gunpla (great! If you intended to render it like that). But if you're seeking for it like as it's REAL. Well you better look for tetsuya yonezu's first delta gundam costum painted build. (I like his paint on plates, even though it's not reflective). In short, texture it more like a metal. It's a gundarium alloy.
Another thing, you said it's prototype EFSF. I think you're referring to Delta Plus Proto. (Sorry but that's really my favorite). Good thing it's only a color scheme because it has a really detailed RG-like plates.
Anyway sorry for being a critique. I can't blame myself, that's my favorite Gundam. But you did a good job! And I see that's not finish. I'll be waiting. Good luck
Very nice, but it doesn't look like it would be a Universal Century machine - it looks to me like it fits better in the Cosmic Era (AKA Gundam SEED) mobile suits. It's just semantics based off of its style, really. Each series has it's own style for how mobile suits are designed, and this looks very SEED to me.