Lambo Farms said:

I would say that maybe try and go out of your comfort zone and try to draw your own hair and improve from there! When you do that the art price goes up better you get at it! However if you keep using premades that are provided on the internet than the price will not improve any. Just my advice :)

When you use pre-cuts you still need to credit the original photographer AS WELL AS the one who did the pre-cut.

In this case, you only credited the person who precut/prepped the horse. You still need to credit this person:

https://www.deviantart.com/shi-stock/art/Harmony-and-Zookie-1-146088723

Make sure you read the information under all precuts you use. This person credited the original person in the comments

https://www.deviantart.com/satrumm/art/Horse-Pre-Cut-3-323732074

You need to make sure you also credit all the people they credit.

Jellos Warmbloods said:

When you use pre-cuts you still need to credit the original photographer AS WELL AS the one who did the pre-cut.

In this case, you only credited the person who precut/prepped the horse. You still need to credit this person:

https://www.deviantart.com/shi-stock/art/Harmony-and-Zookie-1-146088723

Make sure you read the information under all precuts you use. This person credited the original person in the comments

https://www.deviantart.com/satrumm/art/Horse-Pre-Cut-3-323732074

You need to make sure you also credit all the people they credit.