Hi I'm a 3D artist, with demonstrable experience making characters and even exporting .stl files for 3d printing.
I saw both concept references, they are not easy to do, so let me propose something for your convenience: Let's do a test, I will make only 1 (ONE) model for $77.78 usds (freelancer's taxes and fees included). Then if you are happy with my performance as a 3D artist (only if you are satisfied with the work, and after having your approval), I will do the second model but (in this case) I will ask you to do a bonus payment for the same price $77.78 usds before doing the second model.
If everything goes well between you and me, the total ammount of the job (making two models) will be $155.56 usd.
An advise: those models are very detailed so you should pay attention to the freelancer's portfolio before hiring someone (be careful with that), please take a look at my portfolio and consider my offer.
Good luck!