Train the DCGAN using 102 flowers, but it doesn't work well

Hello, I used the 102 flower database to train the model, after 600 epoch, it even cannot generate something like flowers.
How could I do to make it generate more realistic one?
Can change the parameters make it better?
the parameter I put in
python main.py --input_height 96 --input_width 96 --output_height 48 --output_width 48 --dataset jpg --crop --train --epoch 600 --input_fname_pattern "*.jpg"

Please help me with that
Thanks!