Your image is too warm. It has a yellow tint and it needs sharpening. Also, the composition is not good. Follow the Rule of Thirds and use a different format. This leaves empty space for the buyer to use as needed. You should never have your subject leaving the photo. Here is an example:
The camera is rarely the issue, at least for any modern digital camera. You, however, have to know the limits of your camera. The EOS90D has focussing issues at high ISO values, especially with low level lenses. You would probably need many shoots to get one correctly focussed. And you have noise issues with the APS-C sensors.
In addition you will need to correct the white balance and the exposure.
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ABAMBO | Hard- and Software Engineer | Photographer
Your image is too warm. It has a yellow tint and it needs sharpening. Also, the composition is not good. Follow the Rule of Thirds and use a different format. This leaves empty space for the buyer to use as needed. You should never have your subject leaving the photo. Here is an example: