Here is a great video on YouTube you can watch to give you some inspiration for in game graphics for your next project. https://youtu.be/226Nwq2CN5c?si=KGPNq-fDPnTR6Emm
With the free web app like photopea, free tools like Gimp, online video converter to gif, things you have laying around, and your cellphone, your ideas to bring your in-game graphics could be achieved. It could also help you to animate your character movements to make it more smooth or realistic. For example you can record yourself walking and convert that into a gif and use that gif animation as reference to help you draw or animate your character like in the game Prince of Persia . https://youtu.be/sw0VfmXKq54?si=x-W_Il51qMIkukHe