Ah- there's not a lot you can do to help that... unless you have a vector program? Vectors give perfect curves and lines and are easier with a mouse than a tablet. The other option is doing it by hand and scanning it.
Yeah- and a good scanner makes a huge difference. Could try a camera if you can get the lighting right :/ A tablet isn't exactly a cheep option if you'd rather colour traditionally.
Having a decently speced computer helps alot with art. Specially if you layer hog. The memory load and graphics load can be a heavy burden for an old computer.
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Programs cost money -uses GIMP and all its horribleness-