The Tidus one is nice, maybe change the colours into smth more colourful because it's getting too monotone. And bg is all the same so perhaps add ONE brush. Because you didn't put the render in the middle so the right side is empty. Also add text! Honestly screw what guys say at PR! They say text is not necessary but I think it is!

About the WIP... it's not ur style... And it's really hard to make sigs with no bg look good. So try to use images that have a bg like the first one! They're easier.