Love your Tienshinhan artwork! Although I think the humans training at 1000x gravity is a bit extreme (remember Vegeta was only able to go up to 500x before he maxed out), I do love the idea/concept of them using gravity training in order to hone their bodies to be able to withstand and even further the Kaio-ken technique. It really is a shame Akira Toriyama wasted not only Tien, but also Yamcha and Krillin's talents by not having them learn that technique or undergo that training.
I wanted to ask though, is there any chance you would do a picture of Yamcha and Krillin under the same type of training?