Your images look fine at this size, but I'm confident they allow larger output as well. The Tamron is often mentioned as being a very sharp lens.
Another Question:
Is it better to use the manual or the auto focus feature on a macro lens??
Seems on this Tamron,the auto focus was a little slow???
It depends, as usual. First of all, many macro lenses are more about presetting a magnification factor (due to the size of the subject) than focus setting, especially when shooting at 1:1 or larger.
For critical focus, and narrow Depth of Field is a given, it is often preferable to set the focus mechanism to manual, and slowely move the camera or subject forward/backward to achieve focus where you want it.
There is an exception where I do like to use auto focus, namely with handheld shooting in the field to reduce movement by the wind and with following of flying insects or moving insects at relatively high magnification. This does require a fast AF to be successful, which my EF 100mm f/2.8 offers.
If the Tamron's AF is slower, then those subjects that could benefit will not be the most obvious choice.
There are things that can be done to reduce wind movement, but it requires rigging the stems to the ground or camera, or setting up windscreens.
Ultimately the highest quality can be achieved in a studio setup, but that is not always possible/practical. The studio approach does allow to make
stunning shots, but I prefer subjects in their
natural (looking) environment.
Bart