Improving Mecha Graphics and menu

In an effort to elevate the graphics' impact, I am introducing new Mechas with a design that maintains the essence of the originals by using similar colors. However, these updated Mechas boast enhanced features and intricate details, adding a fresh and captivating touch to the visuals.

I am not a graphics expert and to improve I use Stable Diffusion (free software)  to improve my graphics:

Then I open with Krita (free software) and I remove the white color and make pieces of the player (drawing also the hidden parts.

The I save in PSD format (photoshop format) because I can keep each piece in a different layer.

Open the PSD in unity and set the parts and put some bones, set the pivot of each part and the weight of the bones.

Then I create my Mecha GameObject and put all the pieces together. To use the bones I use the SpriteSkin

Then I do all the animation with Unity.

Here is the Selection menu with the girls and their Mechas with the new graphics.