So you've used this stock:
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In my opinion the stock itself looks much better than yours dont take any offence I'll need to be critical to help you improve quicker.
1.The color choice is extremely Fugly, Try to use colors the same as the stock to help it blend more.
2.You've completely spammed the background with burshes. Try to use C4D's or Other stocks aswell as brushes to make it look more cleaner.
3.The text is quite hard to read, use another that stands out but is also good looking and easy to read.
4.Save you're image as a PNG it gives it higher quality.
5. Make another and let me help you improve tht lol :p