gem pricing help?

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?

[spoiler=pixlr editor + mouse][/spoiler]
[spoiler=medibang paint & phone]

[/spoiler]
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.