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3rd option is front and back facing references. These references are roughly 70$ ( More can be added for details of design and also if you want an alternate version with clothes for the design.
Second is regular style commissions, references with a more detailed style. These are roughly worth, 55$. ( More money will be added for same reasons as previous tweet above. )
First is chibi designs, simple references with a simple style, the reference is roughly worth 40$ ( More will be added depending on complexity of it, humanoid or furry, a lot of colors, a lot of gradients and patterns, etc. clothing. )