If you're not sure whether you like the framerates, you should test them first. In my opinion the frames are too low, that it would just look like a cycling image. Also, on your first sprite, try using lower resolution, then work your way up. Some people even stayed on a low resolution but made an amazing art, some are even better than higher resolution. Also, higher resolution tend to need more frames, as it wouldn't seem right. If you are trying the 4-frame walk cycle, try using lower res.