This one definitely peaks my interest a bit more than the other. I've become a much more simplistic person over the years, so might be a tad biased. I'm gonna have to take a swing at doing one here soon too. The only thing I'm noticing with your renders are theyre a tad blurry? I'm not sure what the cause of that might be or if it's on your end of things.
I tend to never make things larger. Scaling down to size seems to be fine, just dont forget to hold shift while you scale to keep the symmetry. However if you take a small vector or image and have to make it bigger, that's when blurry comes into play for me.
Im not in love with this one. Partially because i cant tell whats coming out of the chest area. Its either a heart or a small animal? Also the DX is super hard to read.