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When the image size is on L it says my print size will be 21.4x14.2 at 200 dpi. It that as large as I can go? I want to make a print with approximate same proportions as my human model (from head to toe).....

You can blow it up but it will be pixelated.

Shoot in RAW + JPEG basic.Then choose the image you want from the little JPEG and then convert the RAW into a TIFF at 300 DPI. If your lab cannot handle TIFF, then save as a high resolution JPEG @ 300 DPIThat should give you plenty of detail to make a life size image

Go with fhotoace's advice, but here's an interesting exercise for you anyway... It's my stock answer on poster-sized prints. You may be able to apply some of this logic.Nobday can say whether it is acceptable but you and you CAN test for this to decide. See my tutorial at http://www.flickr.com/photos/samfeinstein/2203190524/ and follow through with this exercise. If you can't print the test at home, I describe how to have Flickr do it for you.I've found that around 100 dpi is "okay" for a poster if you are starting with a decent quality image, which pretty much means if it was from a digital SLR. If you are trying to get a poster out of a point and shoot camera at 95 dpi, just plan on accepting something that looks more like an impressionist painting thana photograph.