yeah a little more exposure would be good.
a little rule i learned is while shooting, if anything try to overexpose a little, because when post-processing you will have more color data (white=all colors) so it looks better when you darken an over exposed photo rather than lighten an underexposed photo
and maybe try some different angles on the flowers, the ones you took were still sick, but just a thought
other than the slight underexposure you got some really good photos