gem pricing help?

[lexasperated]

okay so, i've been meaning to open up shop since i came here and started dabbling with characters, although my abilities are pretty limited and - let's face it, i'm an amateur at the trade. for reference, i'm using my phone and an app called medibang paint to draw, and i don't have a stylus (because i stupidly lost it). i only have three examples for now (the first one was using a browser based program called pixlr editor, the last two from medibang) but i'd like to see what you guys think and how much they should cost in gems and USD?

pixlr editor + mouse:

medibang paint & phone:

as you can see, i'm rly not that good with colors/patterns! or anatomy! but i try, and i think making a shop will help me really improve. i probably won't do anything beyond headshots + bust shots though - at least for now. i'm not good enough to make full-body drawings or anything lmao.