Hello all! I'm fairly new to 3-D design and animation, but so far I've loved every second of it (I'm currently studying at Drexel University and just finished my first year.) This cello is a piece from my final project, and is one of my favorite pieces so far. I'd really appreciate any constructive feedback you guys have for me moving forward from this.
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Here's some terminology that I will be using throughout:
For the cello itself, the side curves ("c-ribs" or "c-bouts") aren't quite the right shape. You can get a really accurate top-down view by checking out photos of old makers' instruments, like this one:
I'd also very carefully check proportions against this image, or another like it. Overlay this with your model in an orthographic view. Measurements for string instruments like this are pretty exact, and although individual instruments may vary slightly, the overall shape is very precise and distinctive. Nailing this will really help the believably. Also make sure you're looking at images of cellos, not violins, because the proportions are a bit different!
There are many other minor proportion and shape issues here, so I'd go over your model and compare parts to the image I pasted above. Here are a few examples:
Now, let's move on to texturing. In general, you have very intense roughness contrast going on in the back of the instrument, which you wouldn't find unless someone literally sanded it for some reason. Most string instruments are fairly consistently glossy because of how they're varnished. If they are older instruments, they're going to get worn slightly and in specific places -- places that are often in contact with the musician playing them. That part of the back isn't one of those places. Here is an example of an older instrument with wear in specific contact points:
I also have feedback on two more small texturing details. First of all, it looks like you're missing the purfling! That's the inlaid decorative strip around the edges of the cello. Googling that term should give you some good references.
And the last thing is, the back of cellos always made out of two pieces of wood since they're so large. See the middle reference in the above image I pasted. There's a seam down the middle. If you really nail the rest of the model, this will look intentional and nice, but I could see this also just looking like a bizarre texture seam if you don't "prove" you know what you're doing for the rest of it.
Whew, I think that's everything. Let me know if you have questions on any of this, and good luck!
ETA: I found an imgur album of pictures I took of my own cello for reference for another Polycounter. A good example of the gloss and wear levels, even an 100+ year old antique instrument! https://imgur.com/a/wO0AT