I draw this one in a A4 (or A5?) size, and when I changes its size to 300x300 for tapas cover, it's getting blurry. I'm too lazy to add any words there but I guess if I did it will just get too crowded. The original file is corrupted and just yesterday medibang staff helped me retrieve the .jpg and .png file for me and I finally manage to set it a cover.
Below is the slightly lower quality of the original cover.
This one is purely sketch I draw on my book, and I just playing with the contrast a bit.
This one is pretty simple since i just put the title there and adjust it there and there since I'm too busy (and lazy) to draw anything. But, hey, simple is better thought?