He does randomly use upper and lower case and often forms letters from the bottom up (mostly) the use of space on paper is bad and makes it less legible. He makes weird pained expressions when he writes, reverses the letter S often. His griplooks ok to me. He finally will draw a bit. He used to refuse. It looks like kindergarten drawings, and not good ones at that.
LRS, I mentioned a lot of things to look for, but that doesn't mean that each of them has to be occurring for dysgraphia to be an issue. I don't have a link I can recall at the moment, but if you google around you'll see there are different presentations/types of dysgraphia - one might involve a spelling challenge, or instance, while another doesn't. It's also important to separate the skills of drawing from handwriting - when you are drawing, you are creating objects rather than relying on automatic memory to be able to draw them, and your pencil also doesn't leave the paper anywhere near as often as it does with handwriting. Some dysgraphics (including my ds) can be quite talented at drawing.
Everything you've listed sounds a lot like dysgraphia. One additional thing you can add to your list is to ask your ds to describe his difficulties with handwriting, or you can ask him some very specific questions, such as "does your wrist hurt when you write".
polarbear