I threw this brief tutorial together for Charclone in a PM, but I realized it might help people here too.
First thing to realize is that AI art is a bit of a gacha. We only publish our better images (usually) and there's several dozen failures for every one that's good. I usually set my system to batch-producing fifty to a hundred images overnight, and maybe one or two will be worth more than recoiling followed by the delete button in the morning. Those one or two will need a few rounds of inpainting and img2img refinement before I want to publish them. For every decent picture somebody posts there were five or six with eleven fingers, an arm growing out of a guy's belly button, or a girl whose mouth is on her throat instead of her face. For the masterpiece quality ones there were probably dozens, maybe hundreds of bad results and slow tweaks using inpaint to get them looking so good.
For getting you started, adding () around a tag increases its weight to the AI, its importance in the picture. So
bunny ears is of basic weight while
(bunny ears) means the AI knows that's of more important and
(((bunny ears))) is given high priority. It's also a good idea to use synonyms, the AI thinks in keywords and models do not always use the same keyword for everything so throwing synonyms at the problem makes it more likely to work.
Note also that every tag
affects the entire image, f'rex if you add
Office background you'll get more bunnies wearing business suits even if that's not in your prompt at all. The AI is accustomed to seeing people in suits inside offices so it will make that mental connection for itself.
Bad prompt:
A bunnygirl wearing a military uniform and armor.
Better:
sharp focus,(8k), (4k), (Masterpiece), (Best Quality, detailed,) (rabbit ears), 1girl, military uniform, (breastplate), knight, armor,
Negative Prompt
(low quality:1.4), (worst quality:1.4),(monochrome:0.8),(extra digits), (cat ears), animal ears, (writing),(signature),(watermark),(words),
Using that Prompt I did a test run and generated a 12 image set. This was using the Anything V3 checkpoint for my base and not including any LORAs, to keep things simple.
In hindsight I should have added
(Rifle), gun, gunbelt to it since you want those elements there. My mistake but I don't have time to do another run right now. This prompt was agnostic as to background, hair color, and facial expression. Assuming I had a more clear idea of what I was doing, I would also add things like
blond hair, brown hair, or
(blue hair) and
smile, happy, angry, etc. to change the facial expression. This checkpoint seems to have a bias for putting blond or pale hair on bunnygirls so it would need weightier hair color tags to compensate if you want a redheaded warrior bunny.
Of those images, I decided to img2img this one:
It seems to have a slight sci-fi bent to the armor, and while the arms and hands aren't great they aren't mangled easier. Also, her head is lower in the frame making the ears more visible.
I added the
(rifle), gun tags to it and it coughed up these img2img results, you can see there's some real improvement and a few more iterations on one of these could yield a halfway decent book cover, with some work refining specific areas and playing with the tags.
Notice that even though I didn't add
Gunbelt, the girls have them anyway. This is an example of what I meant by all tags affecting everything, because a large percentage of images with guns also have people wearing belts with ammo pouches or clips on them, it gave the Warrior Bunnies such belts just because there was a gun tag and it thinks those go together. Similarly if you add
Motorcycle it's more likely to give them helmets, or if you put them in
swimsuits the background is going to change to a pool or beach.
For these specific images, the rifle is quite mangled in one, and one has her fingers blending into the woodwork of the gun which would be
really hard to fix. So assuming I kept refining them, I'd go with one of these.
Both have largely decent bodies and faces but would need so inpainting to fix the hands up and hopefully improve the guns. I like the first one better myself
Hope this helped, if you didn't understand any of the terminology or need more help let me know.