Do you know if you can edit the tools so you can see the shape/size of what you are using? For example, let's say I'm using the eraser tool. In my PaintShop Pro, I have it set so that a thin circle appears to define the edges of my eraser. I haven't found this in Manga Studio yet, so it means a lot of CTRL + Z when I go in too far by accident. I hope this makes sense!
hmmm did you export the file or just post the JPG that it automatically saves in the folder? I always prefer to export the image so that I can see it's full view in photoshop and resize it there. its been a long time since I've done it but i think its just file>export and mess around with the size settings and file type~
what I'd do is export it rediculously large, and then shrink it down in photoshop. that usually looks best. if you take a small one and ty to make it large, no matter what program, it's gonna suck, unless its vector speific like Illustrator.