What tier should I be in?

Examples:

Tier 3, maybe low Tier 2 :)

Your pieces are lovely, I'd work on the resizing (sometimes you lose quality or the horses get squished :( )

And then you could definitely charge more :)

Tier 3 for sure.

Some of the horse images are a bit warped, maybe they were stretched? Be sure that you don't stretch out images one direction or the other.

OK thank you!

Tier 3 with prices around 5-10k. Most of your pieces do not have shadows and you do not do grounding work. You may also want to do some body prep as well as manes and tails. I think your work looks good so far though!

I think tier 3 around 10-15k :)