Harry
Looking at the vacant area in front of her, Miya once again channelled her chakra through her body, directing it towards her mouth as she inhaled a large breath of air. She held the gathered air in her lungs for a few seconds, also letting her chakra pass through it before she exhaled.

From her mouth emerged a powerful blast of ash and cinder, spreading to the sides and even more so forward as it covered the entire half of the training area Miya was facing.

The ash and fire seemed to settled strongly on to the ground, creating a thick blanket of smoke that effectively blocked their sight from what was beyond it. The ashes not only served to created the smoke curtain but also deeply burn the grass they landed on.

Where had once been green, now it was a collection of grey and black, the later being the remains of what vegetation such as flowers and trees had been caught in the blanket wide technique. The heat in the area also increased exponentially, mostly where the ashes had landed. 

As devastating as the technique had been, Miya knew it still could be much worse. She was fairly proficient with fire to know that. The amount of chakra hadn't been the problem but she had felt that she hadn't converted all of it to ash. There had been a bit of a waste in her output.
Susan
*Hajime watched as the cinder and ash blasted out. It looked like a large jutsu, and a devastating one at that. He took another few steps back as the ash and fire settled. It looked like it worked just fine to him. Although a first time success with a jutsu was never usually the case. He did not doubt the abilities of a Chunin, it was just that nobody really understood jutsus on the first attempt. He shook his head as he took another step back. He took a knee as he weaved hand seals. His hand slammed onto the ground. In the middle of charred grass and ash a spike of earth rose from the ground. It was not that tall, also there was only one.*

*More problems caused by his lack of chakra channeled into jutsus. Hajime would need to use more chakra. If he had better control, this wouldn't be a problem, although it was not a big problem. It was just something he needed to smooth over. He continued to take a knee. He would have to refine the jutsu on his next attempt and do it perfectly otherwise he would have wasted all of his chakra for nothing. He took a few deep breaths and prepared to use the jutsu again.*
Harry
"You should rest for a bit and recover your chakra." Miya let out as she turned sideways, just enough so she could see Hajime. She didn't bother explaining how she knew, she just did. "It's important to know your own limits."

It had become more common, at least for Miya, to find genin trying to progress much faster than they could handle. While the risks were minimum during practice, that wasn't the case while on a mission and one should always practice as if they were on a mission.

"If you don't, you might end up killing yourself and everyone else." The tone didn't change which probably made it seem harsher than it was but it was better to get the point across sooner rather than later. 

Turning back, Miya focused on the ash covered ground, already channelling her chakra as she inhaled again. She let it rest and build up in her lungs before exhaling another cloud of burning hot ash. This time, she made sure to properly use every ounce of chakra.

As a result, not only was the smoke much denser, the heat itself was enough to cause the wall Hajime had created to started cracking and breaking.

She turned around again, facing Hajime entirely. Miya was satisfied with her own techniques but she wasn't sure if the genin needed more advice or guidance.