I know the feeling xD Sometimes it is really hard to find someone to do an art trade with you. And I am always feeling bad if I need to say no because a stick man figure is not a trade :c Some people also never do their part. I became skeptical trusting other artists and never show my part first in full resolution.
My AT partners only get a tiny version first so they know, that I am done with my part. The get the big version when they finished their part and I got it.